update the amountString definitionv0.9.3-dev.34

55 files changed, 497 insertions, 459 deletions

diff --git a/packages/anastasis-core/src/policy-suggestion.test.ts b/packages/anastasis-core/src/policy-suggestion.test.ts
index 6370825da..fd42b708f 100644
--- a/packages/anastasis-core/src/policy-suggestion.test.ts
+++ b/packages/anastasis-core/src/policy-suggestion.test.ts
@@ -1,4 +1,4 @@
-import { j2s } from "@gnu-taler/taler-util";
+import { AmountString, j2s } from "@gnu-taler/taler-util";
 import test from "ava";
 import { ProviderInfo, suggestPolicies } from "./policy-suggestion.js";
 
@@ -23,13 +23,13 @@ test("policy suggestion", async (t) => {
   const providers: ProviderInfo[] = [
     {
       methodCost: {
-        sms: "KUDOS:1",
+        sms: "KUDOS:1" as AmountString,
       },
       url: "prov1",
     },
     {
       methodCost: {
-        question: "KUDOS:1",
+        question: "KUDOS:1" as AmountString,
       },
       url: "prov2",
     },
diff --git a/packages/anastasis-core/src/reducer-types.ts b/packages/anastasis-core/src/reducer-types.ts
index 4b87d3ae6..ad88f40ed 100644
--- a/packages/anastasis-core/src/reducer-types.ts
+++ b/packages/anastasis-core/src/reducer-types.ts
@@ -295,7 +295,7 @@ export enum RecoveryStates {
 
 export interface MethodSpec {
   type: string;
-  usage_fee: string;
+  usage_fee: AmountString;
 }
 
 export type AuthenticationProviderStatusNotContacted = {
diff --git a/packages/anastasis-webui/src/pages/home/ChallengeOverviewScreen.stories.tsx b/packages/anastasis-webui/src/pages/home/ChallengeOverviewScreen.stories.tsx
index 1d35c0e91..84df615f3 100644
--- a/packages/anastasis-webui/src/pages/home/ChallengeOverviewScreen.stories.tsx
+++ b/packages/anastasis-webui/src/pages/home/ChallengeOverviewScreen.stories.tsx
@@ -27,6 +27,7 @@ import {
 import { reducerStatesExample } from "../../utils/index.js";
 import { ChallengeOverviewScreen as TestedComponent } from "./ChallengeOverviewScreen.js";
 import * as tests from "@gnu-taler/web-util/testing";
+import { AmountString } from "@gnu-taler/taler-util";
 
 export default {
   title: "Challenge overview",
@@ -256,7 +257,7 @@ export const OnePolicyWithAllTheChallengesInDifferentState =
       "uuid-8": { state: ChallengeFeedbackStatus.RateLimitExceeded.toString() },
       "uuid-9": {
         state: ChallengeFeedbackStatus.IbanInstructions.toString(),
-        challenge_amount: "EUR:1",
+        challenge_amount: "EUR:1" as AmountString,
         target_iban: "DE12345789000",
         target_business_name: "Data Loss Incorporated",
         wire_transfer_subject: "Anastasis 987654321",
diff --git a/packages/anastasis-webui/src/pages/home/authMethod/AuthMethodQuestionSolve.stories.tsx b/packages/anastasis-webui/src/pages/home/authMethod/AuthMethodQuestionSolve.stories.tsx
index fe2cfbebb..dbb17ddab 100644
--- a/packages/anastasis-webui/src/pages/home/authMethod/AuthMethodQuestionSolve.stories.tsx
+++ b/packages/anastasis-webui/src/pages/home/authMethod/AuthMethodQuestionSolve.stories.tsx
@@ -26,6 +26,7 @@ import {
 import { reducerStatesExample } from "../../../utils/index.js";
 import { authMethods as TestedComponent, KnownAuthMethods } from "./index.js";
 import * as tests from "@gnu-taler/web-util/testing";
+import { AmountString } from "@gnu-taler/taler-util";
 
 export default {
   title: "Auth method: Question solve",
@@ -212,7 +213,7 @@ export const IbanInstructionsFeedback = tests.createExample(
     challenge_feedback: {
       "ASDASDSAD!1": {
         state: ChallengeFeedbackStatus.IbanInstructions,
-        challenge_amount: "EUR:1",
+        challenge_amount: "EUR:1" as AmountString,
         target_iban: "DE12345789000",
         target_business_name: "Data Loss Incorporated",
         wire_transfer_subject: "Anastasis 987654321",
diff --git a/packages/taler-harness/src/bench1.ts b/packages/taler-harness/src/bench1.ts
index efe162320..b78fadf0b 100644
--- a/packages/taler-harness/src/bench1.ts
+++ b/packages/taler-harness/src/bench1.ts
@@ -18,6 +18,7 @@
  * Imports.
  */
 import {
+  AmountString,
   buildCodecForObject,
   codecForBoolean,
   codecForNumber,
@@ -97,7 +98,7 @@ export async function runBench1(configJson: any): Promise<void> {
     let start = Date.now();
 
     await wallet.client.call(WalletApiOperation.WithdrawTestBalance, {
-      amount: b1conf.currency + ":" + withdrawAmount,
+      amount: b1conf.currency + ":" + withdrawAmount as AmountString,
       corebankApiBaseUrl: b1conf.bank,
       exchangeBaseUrl: b1conf.exchange,
     });
@@ -116,7 +117,7 @@ export async function runBench1(configJson: any): Promise<void> {
         start = Date.now();
 
         await wallet.client.call(WalletApiOperation.CreateDepositGroup, {
-          amount: b1conf.currency + ":10",
+          amount: b1conf.currency + ":10" as AmountString,
           depositPaytoUri: b1conf.payto,
         });
 
diff --git a/packages/taler-harness/src/bench2.ts b/packages/taler-harness/src/bench2.ts
index 53db6f6c1..87bc2ff7f 100644
--- a/packages/taler-harness/src/bench2.ts
+++ b/packages/taler-harness/src/bench2.ts
@@ -18,6 +18,7 @@
  * Imports.
  */
 import {
+  AmountString,
   buildCodecForObject,
   codecForNumber,
   codecForString,
@@ -85,7 +86,7 @@ export async function runBench2(configJson: any): Promise<void> {
 
     console.log("reserve found");
 
-    const d1 = findDenomOrThrow(exchangeInfo, `${curr}:8`, {
+    const d1 = findDenomOrThrow(exchangeInfo, `${curr}:8` as AmountString, {
       denomselAllowLate: Wallet.defaultConfig.testing.denomselAllowLate,
     });
 
@@ -105,7 +106,7 @@ export async function runBench2(configJson: any): Promise<void> {
       console.log("depositing coin");
 
       await depositCoin({
-        amount: `${curr}:4`,
+        amount: `${curr}:4` as AmountString,
         coin: coin,
         cryptoApi,
         exchangeBaseUrl: benchConf.exchange,
@@ -114,10 +115,10 @@ export async function runBench2(configJson: any): Promise<void> {
       });
 
       const refreshDenoms = [
-        findDenomOrThrow(exchangeInfo, `${curr}:1`, {
+        findDenomOrThrow(exchangeInfo, `${curr}:1` as AmountString, {
           denomselAllowLate: Wallet.defaultConfig.testing.denomselAllowLate,
         }),
-        findDenomOrThrow(exchangeInfo, `${curr}:1`, {
+        findDenomOrThrow(exchangeInfo, `${curr}:1` as AmountString, {
           denomselAllowLate: Wallet.defaultConfig.testing.denomselAllowLate,
         }),
       ];
diff --git a/packages/taler-harness/src/bench3.ts b/packages/taler-harness/src/bench3.ts
index bc345aa9e..c810f6804 100644
--- a/packages/taler-harness/src/bench3.ts
+++ b/packages/taler-harness/src/bench3.ts
@@ -18,6 +18,7 @@
  * Imports.
  */
 import {
+  AmountString,
   buildCodecForObject,
   codecForNumber,
   codecForString,
@@ -108,7 +109,7 @@ export async function runBench3(configJson: any): Promise<void> {
     let start = Date.now();
 
     await wallet.client.call(WalletApiOperation.WithdrawTestBalance, {
-      amount: b3conf.currency + ":" + withdrawAmount,
+      amount: b3conf.currency + ":" + withdrawAmount as AmountString,
       corebankApiBaseUrl: b3conf.bank,
       exchangeBaseUrl: b3conf.exchange,
     });
@@ -129,7 +130,7 @@ export async function runBench3(configJson: any): Promise<void> {
       let payto = b3conf.paytoTemplate.replace("${id}", merchID.toString());
 
       await wallet.client.call(WalletApiOperation.CreateDepositGroup, {
-        amount: b3conf.currency + ":10",
+        amount: b3conf.currency + ":10" as AmountString,
         depositPaytoUri: payto,
       });
 
diff --git a/packages/taler-harness/src/harness/helpers.ts b/packages/taler-harness/src/harness/helpers.ts
index 8c1612457..adf43f6d0 100644
--- a/packages/taler-harness/src/harness/helpers.ts
+++ b/packages/taler-harness/src/harness/helpers.ts
@@ -554,7 +554,7 @@ export async function withdrawViaBankV2(
     walletClient: WalletClient;
     bank: BankService;
     exchange: ExchangeServiceInterface;
-    amount: AmountString;
+    amount: AmountString | string;
     restrictAge?: number;
   },
 ): Promise<WithdrawViaBankResult> {
diff --git a/packages/taler-harness/src/index.ts b/packages/taler-harness/src/index.ts
index 076f71355..09b953a22 100644
--- a/packages/taler-harness/src/index.ts
+++ b/packages/taler-harness/src/index.ts
@@ -33,6 +33,7 @@ import {
   MerchantInstanceConfig,
   Duration,
   generateIban,
+  AmountString,
 } from "@gnu-taler/taler-util";
 import { clk } from "@gnu-taler/taler-util/clk";
 import {
@@ -225,7 +226,7 @@ deploymentCli
   .requiredOption("bankAccount", ["--bank-account"], clk.STRING)
   .requiredOption("bankPassword", ["--bank-password"], clk.STRING)
   .requiredOption("wireMethod", ["--wire-method"], clk.STRING)
-  .requiredOption("amount", ["--amount"], clk.STRING)
+  .requiredOption("amount", ["--amount"], clk.AMOUNT)
   .action(async (args) => {
     const amount = args.tipTopup.amount;
 
@@ -323,7 +324,7 @@ deploymentCli
     const exchangeBaseUrl = "https://exchange.demo.taler.net/";
     const exchangeInfo = await downloadExchangeInfo(exchangeBaseUrl, http);
     await topupReserveWithDemobank({
-      amount: "KUDOS:10",
+      amount: "KUDOS:10" as AmountString,
       corebankApiBaseUrl: "https://bank.demo.taler.net/",
       exchangeInfo,
       http,
@@ -351,7 +352,7 @@ deploymentCli
     const exchangeBaseUrl = "https://exchange.test.taler.net/";
     const exchangeInfo = await downloadExchangeInfo(exchangeBaseUrl, http);
     await topupReserveWithDemobank({
-      amount: "TESTKUDOS:10",
+      amount: "TESTKUDOS:10" as AmountString,
       corebankApiBaseUrl: "https://bank.test.taler.net/",
       exchangeInfo,
       http,
@@ -380,7 +381,7 @@ deploymentCli
     const exchangeBaseUrl = "http://localhost:8081/";
     const exchangeInfo = await downloadExchangeInfo(exchangeBaseUrl, http);
     await topupReserveWithDemobank({
-      amount: "TESTKUDOS:10",
+      amount: "TESTKUDOS:10" as AmountString,
       corebankApiBaseUrl: "http://localhost:8082/taler-bank-access/",
       exchangeInfo,
       http,
diff --git a/packages/taler-harness/src/integrationtests/test-age-restrictions-merchant.ts b/packages/taler-harness/src/integrationtests/test-age-restrictions-merchant.ts
index 5653e22e2..bd4318498 100644
--- a/packages/taler-harness/src/integrationtests/test-age-restrictions-merchant.ts
+++ b/packages/taler-harness/src/integrationtests/test-age-restrictions-merchant.ts
@@ -30,6 +30,7 @@ import {
   TalerCorebankApiClient,
   MerchantApiClient,
   WireGatewayApiClient,
+  AmountString,
 } from "@gnu-taler/taler-util";
 
 /**
@@ -78,7 +79,7 @@ export async function runAgeRestrictionsMerchantTest(t: GlobalTestState) {
       walletClient: walletClientZero,
       bank,
       exchange,
-      amount: "TESTKUDOS:20",
+      amount: "TESTKUDOS:20" as AmountString,
       restrictAge: 13,
     });
     await wres.withdrawalFinishedCond;
@@ -108,7 +109,7 @@ export async function runAgeRestrictionsMerchantTest(t: GlobalTestState) {
       walletClient,
       bank,
       exchange,
-      amount: "TESTKUDOS:20",
+      amount: "TESTKUDOS:20" as AmountString,
       restrictAge: 13,
     });
     await wres.withdrawalFinishedCond;
@@ -134,7 +135,7 @@ export async function runAgeRestrictionsMerchantTest(t: GlobalTestState) {
       walletClient,
       bank,
       exchange,
-      amount: "TESTKUDOS:20",
+      amount: "TESTKUDOS:20" as AmountString,
       restrictAge: 13,
     });
     await wres.withdrawalFinishedCond;
@@ -159,7 +160,7 @@ export async function runAgeRestrictionsMerchantTest(t: GlobalTestState) {
       walletClient,
       bank,
       exchange,
-      amount: "TESTKUDOS:20",
+      amount: "TESTKUDOS:20" as AmountString,
     });
     await wres.withdrawalFinishedCond;
 
@@ -183,7 +184,7 @@ export async function runAgeRestrictionsMerchantTest(t: GlobalTestState) {
     const mbu = await bankClient.createRandomBankUser();
     const tipReserveResp = await merchantClient.createTippingReserve({
       exchange_url: exchange.baseUrl,
-      initial_balance: "TESTKUDOS:10",
+      initial_balance: "TESTKUDOS:10" as AmountString,
       wire_method: getWireMethodForTest(),
     });
 
@@ -211,7 +212,7 @@ export async function runAgeRestrictionsMerchantTest(t: GlobalTestState) {
     await exchange.runWirewatchOnce();
 
     const tip = await merchantClient.giveTip({
-      amount: "TESTKUDOS:5",
+      amount: "TESTKUDOS:5" as AmountString,
       justification: "why not?",
       next_url: "https://example.com/after-tip",
     });
diff --git a/packages/taler-harness/src/integrationtests/test-age-restrictions-mixed-merchant.ts b/packages/taler-harness/src/integrationtests/test-age-restrictions-mixed-merchant.ts
index af90ef1c5..244de1972 100644
--- a/packages/taler-harness/src/integrationtests/test-age-restrictions-mixed-merchant.ts
+++ b/packages/taler-harness/src/integrationtests/test-age-restrictions-mixed-merchant.ts
@@ -26,6 +26,7 @@ import {
   makeTestPaymentV2,
   withdrawViaBankV2,
 } from "../harness/helpers.js";
+import { AmountString } from "@gnu-taler/taler-util";
 
 /**
  * Run test for basic, bank-integrated withdrawal and payment.
@@ -62,7 +63,7 @@ export async function runAgeRestrictionsMixedMerchantTest(t: GlobalTestState) {
       walletClient,
       bank,
       exchange,
-      amount: "TESTKUDOS:20",
+      amount: "TESTKUDOS:20" as AmountString,
       restrictAge: 13,
     });
 
@@ -70,7 +71,7 @@ export async function runAgeRestrictionsMixedMerchantTest(t: GlobalTestState) {
 
     const order = {
       summary: "Buy me!",
-      amount: "TESTKUDOS:5",
+      amount: "TESTKUDOS:5" as AmountString,
       fulfillment_url: "taler://fulfillment-success/thx",
       minimum_age: 9,
     };
@@ -87,7 +88,7 @@ export async function runAgeRestrictionsMixedMerchantTest(t: GlobalTestState) {
       walletClient: walletTwo,
       bank,
       exchange,
-      amount: "TESTKUDOS:20",
+      amount: "TESTKUDOS:20" as AmountString,
       restrictAge: 13,
     });
 
@@ -96,7 +97,7 @@ export async function runAgeRestrictionsMixedMerchantTest(t: GlobalTestState) {
 
     const order = {
       summary: "Buy me!",
-      amount: "TESTKUDOS:5",
+      amount: "TESTKUDOS:5" as AmountString,
       fulfillment_url: "taler://fulfillment-success/thx",
     };
 
@@ -109,7 +110,7 @@ export async function runAgeRestrictionsMixedMerchantTest(t: GlobalTestState) {
       walletClient: walletThree,
       bank,
       exchange,
-      amount: "TESTKUDOS:20",
+      amount: "TESTKUDOS:20" as AmountString,
     });
 
 
diff --git a/packages/taler-harness/src/integrationtests/test-age-restrictions-peer.ts b/packages/taler-harness/src/integrationtests/test-age-restrictions-peer.ts
index 45a4391cb..7506d48b3 100644
--- a/packages/taler-harness/src/integrationtests/test-age-restrictions-peer.ts
+++ b/packages/taler-harness/src/integrationtests/test-age-restrictions-peer.ts
@@ -19,6 +19,7 @@
  */
 import {
   AbsoluteTime,
+  AmountString,
   Duration,
   NotificationType,
   TransactionMajorState,
@@ -82,7 +83,7 @@ export async function runAgeRestrictionsPeerTest(t: GlobalTestState) {
       {
         partialContractTerms: {
           summary: "Hello, World",
-          amount: "TESTKUDOS:1",
+          amount: "TESTKUDOS:1" as AmountString,
           purse_expiration,
         },
       },
diff --git a/packages/taler-harness/src/integrationtests/test-deposit.ts b/packages/taler-harness/src/integrationtests/test-deposit.ts
index d4bfa3da5..1f50377f2 100644
--- a/packages/taler-harness/src/integrationtests/test-deposit.ts
+++ b/packages/taler-harness/src/integrationtests/test-deposit.ts
@@ -18,6 +18,7 @@
  * Imports.
  */
 import {
+  AmountString,
   NotificationType,
   TransactionMajorState,
   TransactionMinorState,
@@ -74,7 +75,7 @@ export async function runDepositTest(t: GlobalTestState) {
   const depositGroupResult = await walletClient.client.call(
     WalletApiOperation.CreateDepositGroup,
     {
-      amount: "TESTKUDOS:10",
+      amount: "TESTKUDOS:10" as AmountString,
       depositPaytoUri: generateRandomPayto("foo"),
       transactionId: depositTxId,
     },
diff --git a/packages/taler-harness/src/integrationtests/test-exchange-deposit.ts b/packages/taler-harness/src/integrationtests/test-exchange-deposit.ts
index 8ad7daa63..8e1726aba 100644
--- a/packages/taler-harness/src/integrationtests/test-exchange-deposit.ts
+++ b/packages/taler-harness/src/integrationtests/test-exchange-deposit.ts
@@ -18,6 +18,7 @@
  * Imports.
  */
 import {
+  AmountString,
   encodeCrock,
   getRandomBytes,
   j2s,
@@ -65,7 +66,7 @@ export async function runExchangeDepositTest(t: GlobalTestState) {
 
     await topupReserveWithDemobank({
       http,
-      amount: "TESTKUDOS:10",
+      amount: "TESTKUDOS:10" as AmountString,
       corebankApiBaseUrl: bank.corebankApiBaseUrl,
       exchangeInfo,
       reservePub: reserveKeyPair.pub,
@@ -75,7 +76,7 @@ export async function runExchangeDepositTest(t: GlobalTestState) {
 
     await checkReserve(http, exchange.baseUrl, reserveKeyPair.pub);
 
-    const d1 = findDenomOrThrow(exchangeInfo, "TESTKUDOS:8", {
+    const d1 = findDenomOrThrow(exchangeInfo, "TESTKUDOS:8" as AmountString, {
       denomselAllowLate: Wallet.defaultConfig.testing.denomselAllowLate,
     });
 
@@ -98,7 +99,7 @@ export async function runExchangeDepositTest(t: GlobalTestState) {
       contractTermsHash,
       merchantPub,
       wireSalt,
-      amount: "TESTKUDOS:4",
+      amount: "TESTKUDOS:4" as AmountString,
       coin: coin,
       cryptoApi,
       exchangeBaseUrl: exchange.baseUrl,
@@ -110,7 +111,7 @@ export async function runExchangeDepositTest(t: GlobalTestState) {
       contractTermsHash,
       merchantPub,
       wireSalt,
-      amount: "TESTKUDOS:4",
+      amount: "TESTKUDOS:4" as AmountString,
       coin: coin,
       cryptoApi,
       exchangeBaseUrl: exchange.baseUrl,
@@ -123,7 +124,7 @@ export async function runExchangeDepositTest(t: GlobalTestState) {
         contractTermsHash,
         merchantPub,
         wireSalt,
-        amount: "TESTKUDOS:3.5",
+        amount: "TESTKUDOS:3.5" as AmountString,
         coin: coin,
         cryptoApi,
         exchangeBaseUrl: exchange.baseUrl,
diff --git a/packages/taler-harness/src/integrationtests/test-exchange-purse.ts b/packages/taler-harness/src/integrationtests/test-exchange-purse.ts
index 33a09ed16..c3815e1de 100644
--- a/packages/taler-harness/src/integrationtests/test-exchange-purse.ts
+++ b/packages/taler-harness/src/integrationtests/test-exchange-purse.ts
@@ -19,6 +19,7 @@
  */
 import {
   AbsoluteTime,
+  AmountString,
   ContractTermsUtil,
   decodeCrock,
   Duration,
@@ -76,7 +77,7 @@ export async function runExchangePurseTest(t: GlobalTestState) {
     });
 
     await topupReserveWithDemobank({
-      amount: "TESTKUDOS:10",
+      amount: "TESTKUDOS:10" as AmountString,
       http,
       reservePub: reserveKeyPair.pub,
       corebankApiBaseUrl: bank.corebankApiBaseUrl,
@@ -91,7 +92,7 @@ export async function runExchangePurseTest(t: GlobalTestState) {
 
     await checkReserve(http, exchange.baseUrl, reserveKeyPair.pub);
 
-    const d1 = findDenomOrThrow(exchangeInfo, "TESTKUDOS:8", {
+    const d1 = findDenomOrThrow(exchangeInfo, "TESTKUDOS:8" as AmountString, {
       denomselAllowLate: Wallet.defaultConfig.testing.denomselAllowLate,
     });
 
@@ -106,7 +107,7 @@ export async function runExchangePurseTest(t: GlobalTestState) {
       exchangeBaseUrl: exchange.baseUrl,
     });
 
-    const amount = "TESTKUDOS:5";
+    const amount = "TESTKUDOS:5" as AmountString;
     const purseFee = "TESTKUDOS:0";
 
     const mergeTimestamp = TalerPreciseTimestamp.now();
diff --git a/packages/taler-harness/src/integrationtests/test-forced-selection.ts b/packages/taler-harness/src/integrationtests/test-forced-selection.ts
index 917ad2025..752810703 100644
--- a/packages/taler-harness/src/integrationtests/test-forced-selection.ts
+++ b/packages/taler-harness/src/integrationtests/test-forced-selection.ts
@@ -17,7 +17,7 @@
 /**
  * Imports.
  */
-import { j2s } from "@gnu-taler/taler-util";
+import { AmountString, j2s } from "@gnu-taler/taler-util";
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
 import { GlobalTestState } from "../harness/harness.js";
 import { createSimpleTestkudosEnvironmentV2 } from "../harness/helpers.js";
@@ -37,12 +37,12 @@ export async function runForcedSelectionTest(t: GlobalTestState) {
 
   await walletClient.call(WalletApiOperation.WithdrawTestBalance, {
     exchangeBaseUrl: exchange.baseUrl,
-    amount: "TESTKUDOS:10",
+    amount: "TESTKUDOS:10" as AmountString,
     corebankApiBaseUrl: bank.corebankApiBaseUrl,
     forcedDenomSel: {
       denoms: [
         {
-          value: "TESTKUDOS:2",
+          value: "TESTKUDOS:2" as AmountString,
           count: 3,
         },
       ],
@@ -56,22 +56,22 @@ export async function runForcedSelectionTest(t: GlobalTestState) {
   t.assertDeepEqual(coinDump.coins.length, 3);
 
   const payResp = await walletClient.call(WalletApiOperation.TestPay, {
-    amount: "TESTKUDOS:3",
+    amount: "TESTKUDOS:3" as AmountString,
     merchantBaseUrl: merchant.makeInstanceBaseUrl(),
     summary: "bla",
     forcedCoinSel: {
       coins: [
         {
-          value: "TESTKUDOS:2",
-          contribution: "TESTKUDOS:1",
+          value: "TESTKUDOS:2" as AmountString,
+          contribution: "TESTKUDOS:1" as AmountString,
         },
         {
-          value: "TESTKUDOS:2",
-          contribution: "TESTKUDOS:1",
+          value: "TESTKUDOS:2" as AmountString,
+          contribution: "TESTKUDOS:1" as AmountString,
         },
         {
-          value: "TESTKUDOS:2",
-          contribution: "TESTKUDOS:1",
+          value: "TESTKUDOS:2" as AmountString,
+          contribution: "TESTKUDOS:1" as AmountString,
         },
       ],
     },
diff --git a/packages/taler-harness/src/integrationtests/test-peer-repair.ts b/packages/taler-harness/src/integrationtests/test-peer-repair.ts
index d457ce1e5..977316174 100644
--- a/packages/taler-harness/src/integrationtests/test-peer-repair.ts
+++ b/packages/taler-harness/src/integrationtests/test-peer-repair.ts
@@ -19,6 +19,7 @@
  */
 import {
   AbsoluteTime,
+  AmountString,
   Duration,
   NotificationType,
   TransactionMajorState,
@@ -92,7 +93,7 @@ export async function runPeerRepairTest(t: GlobalTestState) {
       exchangeBaseUrl: exchange.baseUrl,
       partialContractTerms: {
         summary: "Hello World",
-        amount: "TESTKUDOS:3",
+        amount: "TESTKUDOS:3" as AmountString,
         purse_expiration,
       },
     },
@@ -160,7 +161,7 @@ export async function runPeerRepairTest(t: GlobalTestState) {
       exchangeBaseUrl: exchange.baseUrl,
       partialContractTerms: {
         summary: "Hello World",
-        amount: "TESTKUDOS:3",
+        amount: "TESTKUDOS:3" as AmountString,
         purse_expiration,
       },
     },
diff --git a/packages/taler-harness/src/integrationtests/test-peer-to-peer-pull.ts b/packages/taler-harness/src/integrationtests/test-peer-to-peer-pull.ts
index 6d9f44fb5..7ed716bc1 100644
--- a/packages/taler-harness/src/integrationtests/test-peer-to-peer-pull.ts
+++ b/packages/taler-harness/src/integrationtests/test-peer-to-peer-pull.ts
@@ -19,6 +19,7 @@
  */
 import {
   AbsoluteTime,
+  AmountString,
   Duration,
   j2s,
   NotificationType,
@@ -86,7 +87,7 @@ export async function runPeerToPeerPullTest(t: GlobalTestState) {
       exchangeBaseUrl: exchange.baseUrl,
       partialContractTerms: {
         summary: "Hello World",
-        amount: "TESTKUDOS:5",
+        amount: "TESTKUDOS:5" as AmountString,
         purse_expiration: purseExpiration,
       },
     },
diff --git a/packages/taler-harness/src/integrationtests/test-peer-to-peer-push.ts b/packages/taler-harness/src/integrationtests/test-peer-to-peer-push.ts
index 018fa2020..44c7bf399 100644
--- a/packages/taler-harness/src/integrationtests/test-peer-to-peer-push.ts
+++ b/packages/taler-harness/src/integrationtests/test-peer-to-peer-push.ts
@@ -19,6 +19,7 @@
  */
 import {
   AbsoluteTime,
+  AmountString,
   Duration,
   NotificationType,
   TransactionMajorState,
@@ -80,7 +81,7 @@ export async function runPeerToPeerPushTest(t: GlobalTestState) {
       {
         partialContractTerms: {
           summary: "Hello World 😁😇",
-          amount: "TESTKUDOS:5",
+          amount: "TESTKUDOS:5" as AmountString,
           purse_expiration,
         },
       },
@@ -96,7 +97,7 @@ export async function runPeerToPeerPushTest(t: GlobalTestState) {
     {
       partialContractTerms: {
         summary: "Hello World 🥺",
-        amount: "TESTKUDOS:5",
+        amount: "TESTKUDOS:5" as AmountString,
         purse_expiration,
       },
     },
@@ -148,7 +149,7 @@ export async function runPeerToPeerPushTest(t: GlobalTestState) {
     await w1.walletClient.call(WalletApiOperation.InitiatePeerPushDebit, {
       partialContractTerms: {
         summary: "(this will fail)",
-        amount: "TESTKUDOS:15",
+        amount: "TESTKUDOS:15" as AmountString,
         purse_expiration,
       },
     });
diff --git a/packages/taler-harness/src/integrationtests/test-tipping.ts b/packages/taler-harness/src/integrationtests/test-tipping.ts
index 12cdbae53..16859f98c 100644
--- a/packages/taler-harness/src/integrationtests/test-tipping.ts
+++ b/packages/taler-harness/src/integrationtests/test-tipping.ts
@@ -22,6 +22,7 @@ import {
   MerchantApiClient,
   TransactionMajorState,
   WireGatewayApiClient,
+  AmountString,
 } from "@gnu-taler/taler-util";
 import {
   WalletApiOperation,
@@ -47,7 +48,7 @@ export async function runTippingTest(t: GlobalTestState) {
 
   const tipReserveResp = await merchantClient.createTippingReserve({
     exchange_url: exchange.baseUrl,
-    initial_balance: "TESTKUDOS:10",
+    initial_balance: "TESTKUDOS:10" as AmountString,
     wire_method: getWireMethodForTest(),
   });
 
@@ -90,7 +91,7 @@ export async function runTippingTest(t: GlobalTestState) {
   );
 
   const tip = await merchantClient.giveTip({
-    amount: "TESTKUDOS:5",
+    amount: "TESTKUDOS:5" as AmountString,
     justification: "why not?",
     next_url: "https://example.com/after-tip",
   });
diff --git a/packages/taler-harness/src/integrationtests/test-wallet-dbless.ts b/packages/taler-harness/src/integrationtests/test-wallet-dbless.ts
index 5e6539654..32534f2c8 100644
--- a/packages/taler-harness/src/integrationtests/test-wallet-dbless.ts
+++ b/packages/taler-harness/src/integrationtests/test-wallet-dbless.ts
@@ -18,6 +18,7 @@
  * Imports.
  */
 import {
+  AmountString,
   encodeCrock,
   getRandomBytes,
   j2s,
@@ -69,7 +70,7 @@ export async function runWalletDblessTest(t: GlobalTestState) {
     });
 
     await topupReserveWithDemobank({
-      amount: "TESTKUDOS:10",
+      amount: "TESTKUDOS:10" as AmountString,
       http,
       reservePub: reserveKeyPair.pub,
       corebankApiBaseUrl: bank.corebankApiBaseUrl,
@@ -84,7 +85,7 @@ export async function runWalletDblessTest(t: GlobalTestState) {
 
     await checkReserve(http, exchange.baseUrl, reserveKeyPair.pub);
 
-    const d1 = findDenomOrThrow(exchangeInfo, "TESTKUDOS:8", {
+    const d1 = findDenomOrThrow(exchangeInfo, "TESTKUDOS:8" as AmountString, {
       denomselAllowLate: Wallet.defaultConfig.testing.denomselAllowLate,
     });
 
@@ -107,7 +108,7 @@ export async function runWalletDblessTest(t: GlobalTestState) {
       contractTermsHash,
       merchantPub,
       wireSalt,
-      amount: "TESTKUDOS:4",
+      amount: "TESTKUDOS:4" as AmountString,
       coin: coin,
       cryptoApi,
       exchangeBaseUrl: exchange.baseUrl,
@@ -119,7 +120,7 @@ export async function runWalletDblessTest(t: GlobalTestState) {
       contractTermsHash,
       merchantPub,
       wireSalt,
-      amount: "TESTKUDOS:4",
+      amount: "TESTKUDOS:4" as AmountString,
       coin: coin,
       cryptoApi,
       exchangeBaseUrl: exchange.baseUrl,
@@ -127,10 +128,10 @@ export async function runWalletDblessTest(t: GlobalTestState) {
     });
 
     const refreshDenoms = [
-      findDenomOrThrow(exchangeInfo, "TESTKUDOS:1", {
+      findDenomOrThrow(exchangeInfo, "TESTKUDOS:1" as AmountString, {
         denomselAllowLate: Wallet.defaultConfig.testing.denomselAllowLate,
       }),
-      findDenomOrThrow(exchangeInfo, "TESTKUDOS:1", {
+      findDenomOrThrow(exchangeInfo, "TESTKUDOS:1" as AmountString, {
         denomselAllowLate: Wallet.defaultConfig.testing.denomselAllowLate,
       }),
     ];
diff --git a/packages/taler-harness/src/integrationtests/test-wallet-gendb.ts b/packages/taler-harness/src/integrationtests/test-wallet-gendb.ts
index ff6ed9959..9e3b60899 100644
--- a/packages/taler-harness/src/integrationtests/test-wallet-gendb.ts
+++ b/packages/taler-harness/src/integrationtests/test-wallet-gendb.ts
@@ -26,6 +26,7 @@ import {
 } from "../harness/helpers.js";
 import {
   AbsoluteTime,
+  AmountString,
   Duration,
   NotificationType,
   TransactionMajorState,
@@ -77,7 +78,7 @@ export async function runWalletGenDbTest(t: GlobalTestState) {
       exchangeBaseUrl: exchange.baseUrl,
       partialContractTerms: {
         summary: "Hello World",
-        amount: "TESTKUDOS:5",
+        amount: "TESTKUDOS:5" as AmountString,
         purse_expiration: purseExpiration,
       },
     },
diff --git a/packages/taler-harness/src/integrationtests/test-wallettesting.ts b/packages/taler-harness/src/integrationtests/test-wallettesting.ts
index e5191aa5b..69637b875 100644
--- a/packages/taler-harness/src/integrationtests/test-wallettesting.ts
+++ b/packages/taler-harness/src/integrationtests/test-wallettesting.ts
@@ -22,7 +22,7 @@
 /**
  * Imports.
  */
-import { Amounts, CoinStatus } from "@gnu-taler/taler-util";
+import { AmountString, Amounts, CoinStatus } from "@gnu-taler/taler-util";
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
 import { CoinConfig, defaultCoinConfig } from "../harness/denomStructures.js";
 import {
@@ -118,8 +118,8 @@ export async function runWallettestingTest(t: GlobalTestState) {
   const { wallet, bank, exchange, merchant } = await createMyEnvironment(t);
 
   await wallet.client.call(WalletApiOperation.RunIntegrationTest, {
-    amountToSpend: "TESTKUDOS:5",
-    amountToWithdraw: "TESTKUDOS:10",
+    amountToSpend: "TESTKUDOS:5" as AmountString,
+    amountToWithdraw: "TESTKUDOS:10" as AmountString,
     corebankApiBaseUrl: bank.corebankApiBaseUrl,
     exchangeBaseUrl: exchange.baseUrl,
     merchantAuthToken: merchantAuthToken,
@@ -142,7 +142,7 @@ export async function runWallettestingTest(t: GlobalTestState) {
   wallet.deleteDatabase();
 
   await wallet.client.call(WalletApiOperation.WithdrawTestBalance, {
-    amount: "TESTKUDOS:10",
+    amount: "TESTKUDOS:10" as AmountString,
     corebankApiBaseUrl: bank.corebankApiBaseUrl,
     exchangeBaseUrl: exchange.baseUrl,
   });
@@ -150,7 +150,7 @@ export async function runWallettestingTest(t: GlobalTestState) {
   await wallet.runUntilDone();
 
   await wallet.client.call(WalletApiOperation.TestPay, {
-    amount: "TESTKUDOS:5",
+    amount: "TESTKUDOS:5" as AmountString,
     merchantAuthToken: merchantAuthToken,
     merchantBaseUrl: merchant.makeInstanceBaseUrl(),
     summary: "foo",
@@ -167,7 +167,7 @@ export async function runWallettestingTest(t: GlobalTestState) {
   wallet.deleteDatabase();
 
   await wallet.client.call(WalletApiOperation.WithdrawTestBalance, {
-    amount: "TESTKUDOS:10",
+    amount: "TESTKUDOS:10" as AmountString,
     corebankApiBaseUrl: bank.corebankApiBaseUrl,
     exchangeBaseUrl: exchange.baseUrl,
   });
@@ -203,7 +203,7 @@ export async function runWallettestingTest(t: GlobalTestState) {
   // to pay.
   await t.assertThrowsAsync(async () => {
     await wallet.client.call(WalletApiOperation.TestPay, {
-      amount: "TESTKUDOS:5",
+      amount: "TESTKUDOS:5" as AmountString,
       merchantAuthToken: merchantAuthToken,
       merchantBaseUrl: merchant.makeInstanceBaseUrl(),
       summary: "foo",
@@ -218,7 +218,7 @@ export async function runWallettestingTest(t: GlobalTestState) {
   });
 
   await wallet.client.call(WalletApiOperation.TestPay, {
-    amount: "TESTKUDOS:5",
+    amount: "TESTKUDOS:5" as AmountString,
     merchantAuthToken: merchantAuthToken,
     merchantBaseUrl: merchant.makeInstanceBaseUrl(),
     summary: "foo",
diff --git a/packages/taler-harness/src/integrationtests/test-withdrawal-fakebank.ts b/packages/taler-harness/src/integrationtests/test-withdrawal-fakebank.ts
index e26d9f964..afce2f776 100644
--- a/packages/taler-harness/src/integrationtests/test-withdrawal-fakebank.ts
+++ b/packages/taler-harness/src/integrationtests/test-withdrawal-fakebank.ts
@@ -26,7 +26,7 @@ import {
 } from "../harness/harness.js";
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
 import { CoinConfig, defaultCoinConfig } from "../harness/denomStructures.js";
-import { URL } from "@gnu-taler/taler-util";
+import { AmountString, URL } from "@gnu-taler/taler-util";
 
 /**
  * Run test for basic, bank-integrated withdrawal.
@@ -84,7 +84,7 @@ export async function runWithdrawalFakebankTest(t: GlobalTestState) {
   await wallet.client.call(WalletApiOperation.WithdrawTestBalance, {
     corebankApiBaseUrl: bank.corebankApiBaseUrl,
     exchangeBaseUrl: exchange.baseUrl,
-    amount: "TESTKUDOS:10",
+    amount: "TESTKUDOS:10" as AmountString,
   });
 
   await exchange.runWirewatchOnce();
diff --git a/packages/taler-harness/src/integrationtests/test-withdrawal-huge.ts b/packages/taler-harness/src/integrationtests/test-withdrawal-huge.ts
index 893d870e5..0ad60bcdd 100644
--- a/packages/taler-harness/src/integrationtests/test-withdrawal-huge.ts
+++ b/packages/taler-harness/src/integrationtests/test-withdrawal-huge.ts
@@ -28,6 +28,7 @@ import {
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
 import { CoinConfig, defaultCoinConfig } from "../harness/denomStructures.js";
 import {
+  AmountString,
   NotificationType,
   TransactionMajorState,
   URL,
@@ -101,7 +102,7 @@ export async function runWithdrawalHugeTest(t: GlobalTestState) {
   // Results in about 1K coins withdrawn
   await wallet.client.call(WalletApiOperation.WithdrawTestBalance, {
     exchangeBaseUrl: exchange.baseUrl,
-    amount: "TESTKUDOS:10000",
+    amount: "TESTKUDOS:10000" as AmountString,
     corebankApiBaseUrl: bank.baseUrl,
   });
 
diff --git a/packages/taler-harness/src/integrationtests/test-withdrawal-manual.ts b/packages/taler-harness/src/integrationtests/test-withdrawal-manual.ts
index fa483aa28..8ab029acc 100644
--- a/packages/taler-harness/src/integrationtests/test-withdrawal-manual.ts
+++ b/packages/taler-harness/src/integrationtests/test-withdrawal-manual.ts
@@ -23,6 +23,7 @@ import {
   Logger,
   WireGatewayApiClient,
   j2s,
+  AmountString,
 } from "@gnu-taler/taler-util";
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
 import { GlobalTestState } from "../harness/harness.js";
@@ -60,7 +61,7 @@ export async function runWithdrawalManualTest(t: GlobalTestState) {
     WalletApiOperation.AcceptManualWithdrawal,
     {
       exchangeBaseUrl: exchange.baseUrl,
-      amount: "TESTKUDOS:10",
+      amount: "TESTKUDOS:10" as AmountString,
     },
   );
 
diff --git a/packages/taler-util/src/amounts.test.ts b/packages/taler-util/src/amounts.test.ts
index 644b8bdb4..e592d965c 100644
--- a/packages/taler-util/src/amounts.test.ts
+++ b/packages/taler-util/src/amounts.test.ts
@@ -17,6 +17,7 @@
 import test from "ava";
 
 import { Amounts, AmountJson, amountMaxValue } from "./amounts.js";
+import { AmountString } from "./taler-types.js";
 
 const jAmt = (
   value: number,
@@ -120,31 +121,31 @@ test("amount parsing", (t) => {
 });
 
 test("amount stringification", (t) => {
-  t.is(Amounts.stringify(jAmt(0, 0, "TESTKUDOS")), "TESTKUDOS:0");
-  t.is(Amounts.stringify(jAmt(4, 94000000, "TESTKUDOS")), "TESTKUDOS:4.94");
-  t.is(Amounts.stringify(jAmt(0, 10000000, "TESTKUDOS")), "TESTKUDOS:0.1");
-  t.is(Amounts.stringify(jAmt(0, 1, "TESTKUDOS")), "TESTKUDOS:0.00000001");
-  t.is(Amounts.stringify(jAmt(5, 0, "TESTKUDOS")), "TESTKUDOS:5");
+  t.is(Amounts.stringify(jAmt(0, 0, "TESTKUDOS")), "TESTKUDOS:0" as AmountString);
+  t.is(Amounts.stringify(jAmt(4, 94000000, "TESTKUDOS")), "TESTKUDOS:4.94" as AmountString);
+  t.is(Amounts.stringify(jAmt(0, 10000000, "TESTKUDOS")), "TESTKUDOS:0.1" as AmountString);
+  t.is(Amounts.stringify(jAmt(0, 1, "TESTKUDOS")), "TESTKUDOS:0.00000001" as AmountString);
+  t.is(Amounts.stringify(jAmt(5, 0, "TESTKUDOS")), "TESTKUDOS:5" as AmountString);
   // denormalized
-  t.is(Amounts.stringify(jAmt(1, 100000000, "TESTKUDOS")), "TESTKUDOS:2");
+  t.is(Amounts.stringify(jAmt(1, 100000000, "TESTKUDOS")), "TESTKUDOS:2" as AmountString);
   t.pass();
 });
 
 test("amount multiplication", (t) => {
-  t.is(Amounts.stringify(Amounts.mult(sAmt("EUR:1.11"), 0).amount), "EUR:0");
-  t.is(Amounts.stringify(Amounts.mult(sAmt("EUR:1.11"), 1).amount), "EUR:1.11");
-  t.is(Amounts.stringify(Amounts.mult(sAmt("EUR:1.11"), 2).amount), "EUR:2.22");
-  t.is(Amounts.stringify(Amounts.mult(sAmt("EUR:1.11"), 3).amount), "EUR:3.33");
-  t.is(Amounts.stringify(Amounts.mult(sAmt("EUR:1.11"), 4).amount), "EUR:4.44");
-  t.is(Amounts.stringify(Amounts.mult(sAmt("EUR:1.11"), 5).amount), "EUR:5.55");
+  t.is(Amounts.stringify(Amounts.mult(sAmt("EUR:1.11"), 0).amount), "EUR:0" as AmountString);
+  t.is(Amounts.stringify(Amounts.mult(sAmt("EUR:1.11"), 1).amount), "EUR:1.11" as AmountString);
+  t.is(Amounts.stringify(Amounts.mult(sAmt("EUR:1.11"), 2).amount), "EUR:2.22" as AmountString);
+  t.is(Amounts.stringify(Amounts.mult(sAmt("EUR:1.11"), 3).amount), "EUR:3.33" as AmountString);
+  t.is(Amounts.stringify(Amounts.mult(sAmt("EUR:1.11"), 4).amount), "EUR:4.44" as AmountString);
+  t.is(Amounts.stringify(Amounts.mult(sAmt("EUR:1.11"), 5).amount), "EUR:5.55" as AmountString);
 });
 
 
 
 test("amount division", (t) => {
   t.is(Amounts.divmod("EUR:5", "EUR:1").quotient, 5);
-  t.is(Amounts.stringify(Amounts.divmod("EUR:5", "EUR:1").remainder), "EUR:0");
+  t.is(Amounts.stringify(Amounts.divmod("EUR:5", "EUR:1").remainder), "EUR:0" as AmountString);
 
   t.is(Amounts.divmod("EUR:5", "EUR:2").quotient, 2);
-  t.is(Amounts.stringify(Amounts.divmod("EUR:5", "EUR:2").remainder), "EUR:1");
+  t.is(Amounts.stringify(Amounts.divmod("EUR:5", "EUR:2").remainder), "EUR:1" as AmountString);
 });
diff --git a/packages/taler-util/src/amounts.ts b/packages/taler-util/src/amounts.ts
index ee35a6bbe..082a8168e 100644
--- a/packages/taler-util/src/amounts.ts
+++ b/packages/taler-util/src/amounts.ts
@@ -74,7 +74,7 @@ export const codecForAmountJson = (): Codec<AmountJson> =>
     .property("fraction", codecForNumber())
     .build("AmountJson");
 
-export const codecForAmountString = (): Codec<AmountString> => codecForAmountString();
+export const codecForAmountString = (): Codec<AmountString> => codecForString() as Codec<AmountString>;
 
 /**
  * Result of a possibly overflowing operation.
@@ -469,11 +469,11 @@ export class Amounts {
    * Convert to standard human-readable string representation that's
    * also used in JSON formats.
    */
-  static stringify(a: AmountLike): string {
+  static stringify(a: AmountLike): AmountString {
     a = Amounts.jsonifyAmount(a);
     const s = this.stringifyValue(a);
 
-    return `${a.currency}:${s}`;
+    return `${a.currency}:${s}` as AmountString;
   }
 
   static isSameCurrency(a1: AmountLike, a2: AmountLike): boolean {
diff --git a/packages/taler-util/src/clk.ts b/packages/taler-util/src/clk.ts
index 7bcd19b04..f9f260f83 100644
--- a/packages/taler-util/src/clk.ts
+++ b/packages/taler-util/src/clk.ts
@@ -23,12 +23,14 @@ import {
   readlinePrompt,
   pathBasename,
 } from "#compat-impl";
+import { AmountString } from "./taler-types.js";
 
 export namespace clk {
-  class Converter<T> {}
+  class Converter<T> { }
 
   export const INT = new Converter<number>();
   export const STRING: Converter<string> = new Converter<string>();
+  export const AMOUNT: Converter<AmountString> = new Converter<AmountString>();
 
   export interface OptionArgs<T> {
     help?: string;
@@ -119,7 +121,7 @@ export namespace clk {
       private argKey: string,
       private name: string | null,
       private scArgs: SubcommandArgs,
-    ) {}
+    ) { }
 
     action(f: ActionFn<TG>): void {
       if (this.myAction) {
diff --git a/packages/taler-util/src/wallet-types.ts b/packages/taler-util/src/wallet-types.ts
index 11567b624..7503a4665 100644
--- a/packages/taler-util/src/wallet-types.ts
+++ b/packages/taler-util/src/wallet-types.ts
@@ -559,7 +559,7 @@ export interface CoinDumpJson {
     spend_allocation:
     | {
       id: string;
-      amount: string;
+      amount: AmountString;
     }
     | undefined;
     /**
@@ -890,8 +890,8 @@ export interface PreparePayResultPaymentPossible {
   proposalId: string;
   contractTerms: MerchantContractTerms;
   contractTermsHash: string;
-  amountRaw: string;
-  amountEffective: string;
+  amountRaw: AmountString;
+  amountEffective: AmountString;
   talerUri: string;
 }
 
@@ -903,7 +903,7 @@ export interface PreparePayResultInsufficientBalance {
    */
   proposalId: string;
   contractTerms: MerchantContractTerms;
-  amountRaw: string;
+  amountRaw: AmountString;
   talerUri: string;
   balanceDetails: PayMerchantInsufficientBalanceDetails;
 }
@@ -913,8 +913,8 @@ export interface PreparePayResultAlreadyConfirmed {
   transactionId: TransactionIdStr;
   contractTerms: MerchantContractTerms;
   paid: boolean;
-  amountRaw: string;
-  amountEffective: string | undefined;
+  amountRaw: AmountString;
+  amountEffective: AmountString | undefined;
   contractTermsHash: string;
   /**
    * @deprecated use transactionId
@@ -1553,7 +1553,7 @@ export interface GetExchangeTosResult {
 export interface TestPayArgs {
   merchantBaseUrl: string;
   merchantAuthToken?: string;
-  amount: string;
+  amount: AmountString;
   summary: string;
   forcedCoinSel?: ForcedCoinSel;
 }
@@ -1562,7 +1562,7 @@ export const codecForTestPayArgs = (): Codec<TestPayArgs> =>
   buildCodecForObject<TestPayArgs>()
     .property("merchantBaseUrl", codecForString())
     .property("merchantAuthToken", codecOptional(codecForString()))
-    .property("amount", codecForString())
+    .property("amount", codecForAmountString())
     .property("summary", codecForString())
     .property("forcedCoinSel", codecForAny())
     .build("TestPayArgs");
@@ -1572,8 +1572,8 @@ export interface IntegrationTestArgs {
   corebankApiBaseUrl: string;
   merchantBaseUrl: string;
   merchantAuthToken?: string;
-  amountToWithdraw: string;
-  amountToSpend: string;
+  amountToWithdraw: AmountString;
+  amountToSpend: AmountString;
 }
 
 export const codecForIntegrationTestArgs = (): Codec<IntegrationTestArgs> =>
@@ -1647,7 +1647,7 @@ export const codecForGetExchangeTosRequest = (): Codec<GetExchangeTosRequest> =>
 
 export interface AcceptManualWithdrawalRequest {
   exchangeBaseUrl: string;
-  amount: string;
+  amount: AmountString;
   restrictAge?: number;
 }
 
@@ -1655,13 +1655,13 @@ export const codecForAcceptManualWithdrawalRequet =
   (): Codec<AcceptManualWithdrawalRequest> =>
     buildCodecForObject<AcceptManualWithdrawalRequest>()
       .property("exchangeBaseUrl", codecForString())
-      .property("amount", codecForString())
+      .property("amount", codecForAmountString())
       .property("restrictAge", codecOptional(codecForNumber()))
       .build("AcceptManualWithdrawalRequest");
 
 export interface GetWithdrawalDetailsForAmountRequest {
   exchangeBaseUrl: string;
-  amount: string;
+  amount: AmountString;
   restrictAge?: number;
 }
 
@@ -1685,7 +1685,7 @@ export const codecForGetWithdrawalDetailsForAmountRequest =
   (): Codec<GetWithdrawalDetailsForAmountRequest> =>
     buildCodecForObject<GetWithdrawalDetailsForAmountRequest>()
       .property("exchangeBaseUrl", codecForString())
-      .property("amount", codecForString())
+      .property("amount", codecForAmountString())
       .property("restrictAge", codecOptional(codecForNumber()))
       .build("GetWithdrawalDetailsForAmountRequest");
 
@@ -1873,7 +1873,7 @@ export interface CoreApiResponseError {
 }
 
 export interface WithdrawTestBalanceRequest {
-  amount: string;
+  amount: AmountString;
   /**
    * Corebank API base URL.
    */
@@ -1947,7 +1947,7 @@ export interface RecoveryLoadRequest {
 export const codecForWithdrawTestBalance =
   (): Codec<WithdrawTestBalanceRequest> =>
     buildCodecForObject<WithdrawTestBalanceRequest>()
-      .property("amount", codecForString())
+      .property("amount", codecForAmountString())
       .property("exchangeBaseUrl", codecForString())
       .property("forcedDenomSel", codecForAny())
       .property("corebankApiBaseUrl", codecForString())
diff --git a/packages/taler-wallet-cli/src/index.ts b/packages/taler-wallet-cli/src/index.ts
index f3b205211..ee6b93381 100644
--- a/packages/taler-wallet-cli/src/index.ts
+++ b/packages/taler-wallet-cli/src/index.ts
@@ -21,6 +21,7 @@ import {
   AbsoluteTime,
   addPaytoQueryParams,
   AgeRestriction,
+  AmountString,
   codecForList,
   codecForString,
   CoreApiResponse,
@@ -592,7 +593,7 @@ withdrawCli
 withdrawCli
   .subcommand("withdrawCheckAmount", "check-amount")
   .requiredArgument("exchange", clk.STRING)
-  .requiredArgument("amount", clk.STRING)
+  .requiredArgument("amount", clk.AMOUNT)
   .maybeOption("restrictAge", ["--restrict-age"], clk.INT)
   .action(async (args) => {
     const restrictAge = args.withdrawCheckAmount.restrictAge;
@@ -728,7 +729,7 @@ withdrawCli
   .requiredOption("exchange", ["--exchange"], clk.STRING, {
     help: "Base URL of the exchange.",
   })
-  .requiredOption("amount", ["--amount"], clk.STRING, {
+  .requiredOption("amount", ["--amount"], clk.AMOUNT, {
     help: "Amount to withdraw",
   })
   .maybeOption("restrictAge", ["--restrict-age"], clk.INT)
@@ -960,7 +961,7 @@ const depositCli = walletCli.subcommand("depositArgs", "deposit", {
 
 depositCli
   .subcommand("createDepositArgs", "create")
-  .requiredArgument("amount", clk.STRING)
+  .requiredArgument("amount", clk.AMOUNT)
   .requiredArgument("targetPayto", clk.STRING)
   .action(async (args) => {
     await withLocalWallet(args, async (wallet) => {
@@ -984,7 +985,7 @@ peerCli
   .subcommand("checkPayPush", "check-push-debit", {
     help: "Check fees for starting a peer-push debit transaction.",
   })
-  .requiredArgument("amount", clk.STRING, {
+  .requiredArgument("amount", clk.AMOUNT, {
     help: "Amount to pay",
   })
   .action(async (args) => {
@@ -1003,7 +1004,7 @@ peerCli
   .subcommand("checkPayPull", "check-pull-credit", {
     help: "Check fees for a starting peer-pull credit transaction.",
   })
-  .requiredArgument("amount", clk.STRING, {
+  .requiredArgument("amount", clk.AMOUNT, {
     help: "Amount to request",
   })
   .action(async (args) => {
@@ -1067,7 +1068,7 @@ peerCli
   .subcommand("initiatePayPull", "initiate-pull-credit", {
     help: "Initiate a peer-pull payment.",
   })
-  .requiredArgument("amount", clk.STRING, {
+  .requiredArgument("amount", clk.AMOUNT, {
     help: "Amount to request",
   })
   .maybeOption("summary", ["--summary"], clk.STRING, {
@@ -1125,7 +1126,7 @@ peerCli
   .subcommand("payPush", "initiate-push-debit", {
     help: "Initiate a peer-push payment.",
   })
-  .requiredArgument("amount", clk.STRING, {
+  .requiredArgument("amount", clk.AMOUNT, {
     help: "Amount to pay",
   })
   .maybeOption("summary", ["--summary"], clk.STRING, {
@@ -1239,7 +1240,7 @@ advancedCli
     help: "Initialize the wallet (with DB) and exit.",
   })
   .action(async (args) => {
-    await withWallet(args, async () => {});
+    await withWallet(args, async () => { });
   });
 
 advancedCli
@@ -1278,8 +1279,8 @@ advancedCli
     const wallet = res.wallet;
     await wallet.client.call(WalletApiOperation.InitWallet, {});
     await wallet.client.call(WalletApiOperation.RunIntegrationTest, {
-      amountToSpend: "TESTKUDOS:1",
-      amountToWithdraw: "TESTKUDOS:3",
+      amountToSpend: "TESTKUDOS:1" as AmountString,
+      amountToWithdraw: "TESTKUDOS:3" as AmountString,
       corebankApiBaseUrl: "http://localhost:8082/taler-bank-access/",
       exchangeBaseUrl: "http://localhost:8081/",
       merchantBaseUrl: "http://localhost:8083/",
@@ -1506,7 +1507,7 @@ testCli
 testCli.subcommand("withdrawKudos", "withdraw-kudos").action(async (args) => {
   await withWallet(args, async (wallet) => {
     await wallet.client.call(WalletApiOperation.WithdrawTestBalance, {
-      amount: "KUDOS:50",
+      amount: "KUDOS:50" as AmountString,
       corebankApiBaseUrl:
         "https://bank.demo.taler.net/",
       exchangeBaseUrl: "https://exchange.demo.taler.net/",
diff --git a/packages/taler-wallet-core/src/operations/testing.ts b/packages/taler-wallet-core/src/operations/testing.ts
index f5bed13dd..3fff9ccaa 100644
--- a/packages/taler-wallet-core/src/operations/testing.ts
+++ b/packages/taler-wallet-core/src/operations/testing.ts
@@ -680,7 +680,7 @@ export async function runIntegrationTest2(
 
   const peerPushInit = await initiatePeerPushDebit(ws, {
     partialContractTerms: {
-      amount: `${currency}:1`,
+      amount: `${currency}:1` as AmountString,
       summary: "Payment Peer Push Test",
       purse_expiration: AbsoluteTime.toProtocolTimestamp(
         AbsoluteTime.addDuration(
@@ -703,7 +703,7 @@ export async function runIntegrationTest2(
 
   const peerPullInit = await initiatePeerPullPayment(ws, {
     partialContractTerms: {
-      amount: `${currency}:1`,
+      amount: `${currency}:1` as AmountString,
       summary: "Payment Peer Pull Test",
       purse_expiration: AbsoluteTime.toProtocolTimestamp(
         AbsoluteTime.addDuration(
diff --git a/packages/taler-wallet-core/src/operations/withdraw.test.ts b/packages/taler-wallet-core/src/operations/withdraw.test.ts
index cb8aa5e81..97a80ec26 100644
--- a/packages/taler-wallet-core/src/operations/withdraw.test.ts
+++ b/packages/taler-wallet-core/src/operations/withdraw.test.ts
@@ -14,7 +14,7 @@
  GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
  */
 
-import { Amounts, DenomKeyType } from "@gnu-taler/taler-util";
+import { AmountString, Amounts, DenomKeyType } from "@gnu-taler/taler-util";
 import test from "ava";
 import {
   DenominationRecord,
@@ -82,7 +82,7 @@ test("withdrawal selection bug repro", (t) => {
       }),
       verificationStatus: DenominationVerificationStatus.Unverified,
       currency: "KUDOS",
-      value: "KUDOS:1000",
+      value: "KUDOS:1000" as AmountString,
       listIssueDate: timestampProtocolToDb({ t_s: 0 }),
     },
     {
@@ -136,7 +136,7 @@ test("withdrawal selection bug repro", (t) => {
         t_s: 1585229388,
       }),
       verificationStatus: DenominationVerificationStatus.Unverified,
-      value: "KUDOS:10",
+      value: "KUDOS:10" as AmountString,
       currency: "KUDOS",
       listIssueDate: timestampProtocolToDb({ t_s: 0 }),
     },
@@ -190,7 +190,7 @@ test("withdrawal selection bug repro", (t) => {
         t_s: 1585229388,
       }),
       verificationStatus: DenominationVerificationStatus.Unverified,
-      value: "KUDOS:5",
+      value: "KUDOS:5" as AmountString,
       currency: "KUDOS",
       listIssueDate: timestampProtocolToDb({ t_s: 0 }),
     },
@@ -245,7 +245,7 @@ test("withdrawal selection bug repro", (t) => {
         t_s: 1585229388,
       }),
       verificationStatus: DenominationVerificationStatus.Unverified,
-      value: "KUDOS:1",
+      value: "KUDOS:1" as AmountString,
       currency: "KUDOS",
       listIssueDate: timestampProtocolToDb({ t_s: 0 }),
     },
@@ -357,7 +357,7 @@ test("withdrawal selection bug repro", (t) => {
         t_s: 1585229388,
       }),
       verificationStatus: DenominationVerificationStatus.Unverified,
-      value: "KUDOS:2",
+      value: "KUDOS:2" as AmountString,
       currency: "KUDOS",
       listIssueDate: timestampProtocolToDb({ t_s: 0 }),
     },
diff --git a/packages/taler-wallet-core/src/util/coinSelection.test.ts b/packages/taler-wallet-core/src/util/coinSelection.test.ts
index 81a656f8a..69c25a2fa 100644
--- a/packages/taler-wallet-core/src/util/coinSelection.test.ts
+++ b/packages/taler-wallet-core/src/util/coinSelection.test.ts
@@ -48,9 +48,9 @@ test("p2p: should select the coin", (t) => {
   const coins = testing_greedySelectPeer(
     createCandidates([
       {
-        amount: "LOCAL:10",
+        amount: "LOCAL:10" as AmountString,
         numAvailable: 5,
-        depositFee: "LOCAL:0.1",
+        depositFee: "LOCAL:0.1" as AmountString,
         fromExchange: "http://exchange.localhost/",
       },
     ]),
@@ -86,9 +86,9 @@ test("p2p: should select 3 coins", (t) => {
   const coins = testing_greedySelectPeer(
     createCandidates([
       {
-        amount: "LOCAL:10",
+        amount: "LOCAL:10" as AmountString,
         numAvailable: 5,
-        depositFee: "LOCAL:0.1",
+        depositFee: "LOCAL:0.1" as AmountString,
         fromExchange: "http://exchange.localhost/",
       },
     ]),
@@ -126,9 +126,9 @@ test("p2p: can't select since the instructed amount is too high", (t) => {
   const coins = testing_greedySelectPeer(
     createCandidates([
       {
-        amount: "LOCAL:10",
+        amount: "LOCAL:10" as AmountString,
         numAvailable: 5,
-        depositFee: "LOCAL:0.1",
+        depositFee: "LOCAL:0.1" as AmountString,
         fromExchange: "http://exchange.localhost/",
       },
     ]),
@@ -176,9 +176,9 @@ test("pay: select one coin to pay with fee", (t) => {
     },
     createCandidates([
       {
-        amount: "LOCAL:10",
+        amount: "LOCAL:10" as AmountString,
         numAvailable: 5,
-        depositFee: "LOCAL:0.1",
+        depositFee: "LOCAL:0.1" as AmountString,
         fromExchange: "http://exchange.localhost/",
       },
     ]),
@@ -224,9 +224,9 @@ function createCandidates(
       denomPubHash: `hash${idx}`,
       value: r.amount,
       feeDeposit: r.depositFee,
-      feeRefresh: "LOCAL:0",
-      feeRefund: "LOCAL:0",
-      feeWithdraw: "LOCAL:0",
+      feeRefresh: "LOCAL:0" as AmountString,
+      feeRefund: "LOCAL:0" as AmountString,
+      feeWithdraw: "LOCAL:0" as AmountString,
       stampExpireDeposit: inTheDistantFuture,
       stampExpireLegal: inTheDistantFuture,
       stampExpireWithdraw: inTheDistantFuture,
diff --git a/packages/taler-wallet-core/src/util/denominations.test.ts b/packages/taler-wallet-core/src/util/denominations.test.ts
index 25dbda081..98af5d1a4 100644
--- a/packages/taler-wallet-core/src/util/denominations.test.ts
+++ b/packages/taler-wallet-core/src/util/denominations.test.ts
@@ -39,7 +39,7 @@ import test, { ExecutionContext } from "ava";
  * Create some constants to be used as reference in the tests
  */
 const VALUES: AmountString[] = Array.from({ length: 10 }).map(
-  (undef, t) => `USD:${t}`,
+  (undef, t) => `USD:${t}` as AmountString,
 );
 const TIMESTAMPS = Array.from({ length: 20 }).map((undef, t_s) => ({ t_s }));
 const ABS_TIME = TIMESTAMPS.map((m) => AbsoluteTime.fromProtocolTimestamp(m));
diff --git a/packages/taler-wallet-core/src/wallet.ts b/packages/taler-wallet-core/src/wallet.ts
index 6600aa799..fe77fecc1 100644
--- a/packages/taler-wallet-core/src/wallet.ts
+++ b/packages/taler-wallet-core/src/wallet.ts
@@ -132,6 +132,7 @@ import {
   codecForListExchangesForScopedCurrencyRequest,
   ListExchangesForScopedCurrencyRequest,
   ExchangesShortListResponse,
+  AmountString,
 } from "@gnu-taler/taler-util";
 import type { HttpRequestLibrary } from "@gnu-taler/taler-util/http";
 import { readSuccessResponseJsonOrThrow } from "@gnu-taler/taler-util/http";
@@ -931,9 +932,9 @@ async function dumpCoins(ws: InternalWalletState): Promise<CoinDumpJson> {
           ageCommitmentProof: c.ageCommitmentProof,
           spend_allocation: c.spendAllocation
             ? {
-                amount: c.spendAllocation.amount,
-                id: c.spendAllocation.id,
-              }
+              amount: c.spendAllocation.amount,
+              id: c.spendAllocation.id,
+            }
             : undefined,
         });
       }
@@ -1076,7 +1077,7 @@ async function dispatchRequestInternal<Op extends WalletApiOperation>(
     }
     case WalletApiOperation.WithdrawTestkudos: {
       await withdrawTestBalance(ws, {
-        amount: "TESTKUDOS:10",
+        amount: "TESTKUDOS:10" as AmountString,
         corebankApiBaseUrl: "https://bank.test.taler.net/",
         exchangeBaseUrl: "https://exchange.test.taler.net/",
       });
@@ -1278,7 +1279,7 @@ async function dispatchRequestInternal<Op extends WalletApiOperation>(
         typeof url.templateParams.amount === "string"
       ) {
         templateDetails.amount =
-          req.templateParams.amount ?? url.templateParams.amount;
+          (req.templateParams.amount ?? url.templateParams.amount) as AmountString | undefined;
       }
       if (
         url.templateParams.summary !== undefined &&
diff --git a/packages/taler-wallet-webextension/src/components/Amount.stories.tsx b/packages/taler-wallet-webextension/src/components/Amount.stories.tsx
index 095c9be24..fa28088eb 100644
--- a/packages/taler-wallet-webextension/src/components/Amount.stories.tsx
+++ b/packages/taler-wallet-webextension/src/components/Amount.stories.tsx
@@ -22,6 +22,7 @@
 import { styled } from "@linaria/react";
 import { Fragment, h, VNode } from "preact";
 import { Amount } from "./Amount.js";
+import { AmountString } from "@gnu-taler/taler-util";
 
 export default {
   title: "amount",
@@ -39,7 +40,7 @@ const Table = styled.table`
 
 function ProductTable(
   prods: string[],
-  AmountRender: (p: { value: string; index: number }) => VNode = Amount,
+  AmountRender: (p: { value: AmountString; index: number }) => VNode = Amount,
 ): VNode {
   return (
     <Table>
@@ -52,7 +53,7 @@ function ProductTable(
           <tr key={i}>
             <td>p{i}</td>
             <td>
-              <AmountRender value={value} index={i} />
+              <AmountRender value={value as AmountString} index={i} />
               {/* <Amount value={value} fracSize={fracSize} /> */}
             </td>
           </tr>
diff --git a/packages/taler-wallet-webextension/src/components/ShowFullContractTermPopup.stories.tsx b/packages/taler-wallet-webextension/src/components/ShowFullContractTermPopup.stories.tsx
index 1b1802b8c..555b300c2 100644
--- a/packages/taler-wallet-webextension/src/components/ShowFullContractTermPopup.stories.tsx
+++ b/packages/taler-wallet-webextension/src/components/ShowFullContractTermPopup.stories.tsx
@@ -25,14 +25,14 @@ import {
   LoadingView,
   ShowView,
 } from "./ShowFullContractTermPopup.js";
-import { WalletContractData } from "@gnu-taler/taler-util";
+import { AmountString, WalletContractData } from "@gnu-taler/taler-util";
 
 export default {
   title: "ShowFullContractTermPopup",
 };
 
 const cd: WalletContractData = {
-  amount: "ARS:2",
+  amount: "ARS:2" as AmountString,
   contractTermsHash:
     "92X0KSJPZ8XS2XECCGFWTCGW8XMFCXTT2S6WHZDP6H9Y3TSKMTHY94WXEWDERTNN5XWCYGW4VN5CF2D4846HXTW7P06J4CZMHCWKC9G",
   fulfillmentUrl: "",
@@ -42,7 +42,7 @@ const cd: WalletContractData = {
     "0YA1WETV15R6K8QKS79QA3QMT16010F42Q49VSKYQ71HVQKAG0A4ZJCA4YTKHE9EA5SP156TJSKZEJJJ87305N6PS80PC48RNKYZE08",
   orderId: "2022.220-0281XKKB8W7YE",
   summary: "w",
-  maxWireFee: "ARS:1",
+  maxWireFee: "ARS:1" as AmountString,
   payDeadline: {
     t_s: 1660002673,
   },
@@ -62,7 +62,7 @@ const cd: WalletContractData = {
   wireMethod: "x-taler-bank",
   wireInfoHash:
     "QDT28374ZHYJ59WQFZ3TW1D5WKJVDYHQT86VHED3TNMB15ANJSKXDYPPNX01348KDYCX6T4WXA5A8FJJ8YWNEB1JW726C1JPKHM89DR",
-  maxDepositFee: "ARS:1",
+  maxDepositFee: "ARS:1" as AmountString,
   merchant: {
     name: "Default",
     address: {
diff --git a/packages/taler-wallet-webextension/src/cta/Deposit/test.ts b/packages/taler-wallet-webextension/src/cta/Deposit/test.ts
index 144bdccf4..100929918 100644
--- a/packages/taler-wallet-webextension/src/cta/Deposit/test.ts
+++ b/packages/taler-wallet-webextension/src/cta/Deposit/test.ts
@@ -19,7 +19,7 @@
  * @author Sebastian Javier Marchano (sebasjm)
  */
 
-import { Amounts } from "@gnu-taler/taler-util";
+import { AmountString, Amounts } from "@gnu-taler/taler-util";
 import { expect } from "chai";
 import { createWalletApiMock } from "../../test-utils.js";
 import { useComponentState } from "./state.js";
@@ -72,19 +72,19 @@ describe("Deposit CTA states", () => {
       WalletApiOperation.PrepareDeposit,
       undefined,
       {
-        effectiveDepositAmount: "EUR:1",
-        totalDepositCost: "EUR:1.2",
+        effectiveDepositAmount: "EUR:1" as AmountString,
+        totalDepositCost: "EUR:1.2" as AmountString,
         fees: {
-          coin: "EUR:0",
-          refresh: "EUR:0.2",
-          wire: "EUR:0",
+          coin: "EUR:0" as AmountString,
+          refresh: "EUR:0.2" as AmountString,
+          wire: "EUR:0" as AmountString,
         },
       },
     );
 
     const props = {
       talerDepositUri: "payto://refund/asdasdas",
-      amountStr: "EUR:1",
+      amountStr: "EUR:1" as AmountString,
       cancel: async () => {
         null;
       },
diff --git a/packages/taler-wallet-webextension/src/cta/InvoiceCreate/index.ts b/packages/taler-wallet-webextension/src/cta/InvoiceCreate/index.ts
index b8aaed3f2..fd3fb52f8 100644
--- a/packages/taler-wallet-webextension/src/cta/InvoiceCreate/index.ts
+++ b/packages/taler-wallet-webextension/src/cta/InvoiceCreate/index.ts
@@ -14,7 +14,7 @@
  GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
  */
 
-import { AmountJson } from "@gnu-taler/taler-util";
+import { AmountJson, AmountString } from "@gnu-taler/taler-util";
 import { ErrorAlertView } from "../../components/CurrentAlerts.js";
 import { Loading } from "../../components/Loading.js";
 import { ErrorAlert } from "../../context/alert.js";
@@ -27,7 +27,7 @@ import { useComponentState } from "./state.js";
 import { ReadyView } from "./views.js";
 
 export interface Props {
-  amount: string;
+  amount: AmountString;
   onClose: () => Promise<void>;
   onSuccess: (tx: string) => Promise<void>;
 }
diff --git a/packages/taler-wallet-webextension/src/cta/Payment/stories.tsx b/packages/taler-wallet-webextension/src/cta/Payment/stories.tsx
index f030fa219..eee5fb684 100644
--- a/packages/taler-wallet-webextension/src/cta/Payment/stories.tsx
+++ b/packages/taler-wallet-webextension/src/cta/Payment/stories.tsx
@@ -20,6 +20,7 @@
  */
 
 import {
+  AmountString,
   Amounts,
   MerchantContractTerms as ContractTerms,
   PreparePayResultType,
@@ -52,13 +53,13 @@ export const NoEnoughBalanceAvailable = tests.createExample(BaseView, {
     transactionId: " " as TransactionIdStr,
     status: PreparePayResultType.InsufficientBalance,
     balanceDetails: {
-      amountRequested: "USD:10",
-      balanceAvailable: "USD:9",
-      balanceMaterial: "USD:9",
-      balanceAgeAcceptable: "USD:9",
-      balanceMerchantAcceptable: "USD:9",
-      balanceMerchantDepositable: "USD:9",
-      feeGapEstimate: "USD:1",
+      amountRequested: "USD:10" as AmountString,
+      balanceAvailable: "USD:9" as AmountString,
+      balanceMaterial: "USD:9" as AmountString,
+      balanceAgeAcceptable: "USD:9" as AmountString,
+      balanceMerchantAcceptable: "USD:9" as AmountString,
+      balanceMerchantDepositable: "USD:9" as AmountString,
+      feeGapEstimate: "USD:1" as AmountString,
     },
     talerUri: "taler://pay/..",
 
@@ -73,7 +74,7 @@ export const NoEnoughBalanceAvailable = tests.createExample(BaseView, {
       summary: "some beers",
       amount: "USD:10",
     } as Partial<ContractTerms> as any,
-    amountRaw: "USD:10",
+    amountRaw: "USD:10" as AmountString,
   },
 });
 
@@ -92,13 +93,13 @@ export const NoEnoughBalanceMaterial = tests.createExample(BaseView, {
     transactionId: " " as TransactionIdStr,
     status: PreparePayResultType.InsufficientBalance,
     balanceDetails: {
-      amountRequested: "USD:10",
-      balanceAvailable: "USD:10",
-      balanceMaterial: "USD:9",
-      balanceAgeAcceptable: "USD:9",
-      balanceMerchantAcceptable: "USD:9",
-      balanceMerchantDepositable: "USD:0",
-      feeGapEstimate: "USD:1",
+      amountRequested: "USD:10" as AmountString,
+      balanceAvailable: "USD:10" as AmountString,
+      balanceMaterial: "USD:9" as AmountString,
+      balanceAgeAcceptable: "USD:9" as AmountString,
+      balanceMerchantAcceptable: "USD:9" as AmountString,
+      balanceMerchantDepositable: "USD:0" as AmountString,
+      feeGapEstimate: "USD:1" as AmountString,
     },
     talerUri: "taler://pay/..",
 
@@ -111,9 +112,9 @@ export const NoEnoughBalanceMaterial = tests.createExample(BaseView, {
         email: "contact@merchant.taler",
       },
       summary: "some beers",
-      amount: "USD:10",
+      amount: "USD:10" as AmountString,
     } as Partial<ContractTerms> as any,
-    amountRaw: "USD:10",
+    amountRaw: "USD:10" as AmountString,
   },
 });
 
@@ -132,13 +133,13 @@ export const NoEnoughBalanceAgeAcceptable = tests.createExample(BaseView, {
     transactionId: " " as TransactionIdStr,
     status: PreparePayResultType.InsufficientBalance,
     balanceDetails: {
-      amountRequested: "USD:10",
-      balanceAvailable: "USD:10",
-      balanceMaterial: "USD:10",
-      balanceAgeAcceptable: "USD:9",
-      balanceMerchantAcceptable: "USD:9",
-      balanceMerchantDepositable: "USD:9",
-      feeGapEstimate: "USD:1",
+      amountRequested: "USD:10" as AmountString,
+      balanceAvailable: "USD:10" as AmountString,
+      balanceMaterial: "USD:10" as AmountString,
+      balanceAgeAcceptable: "USD:9" as AmountString,
+      balanceMerchantAcceptable: "USD:9" as AmountString,
+      balanceMerchantDepositable: "USD:9" as AmountString,
+      feeGapEstimate: "USD:1" as AmountString,
     },
     talerUri: "taler://pay/..",
 
@@ -154,7 +155,7 @@ export const NoEnoughBalanceAgeAcceptable = tests.createExample(BaseView, {
       summary: "some beers",
       amount: "USD:10",
     } as Partial<ContractTerms> as any,
-    amountRaw: "USD:10",
+    amountRaw: "USD:10" as AmountString,
   },
 });
 
@@ -173,13 +174,13 @@ export const NoEnoughBalanceMerchantAcceptable = tests.createExample(BaseView, {
     transactionId: " " as TransactionIdStr,
     status: PreparePayResultType.InsufficientBalance,
     balanceDetails: {
-      amountRequested: "USD:10",
-      balanceAvailable: "USD:10",
-      balanceMaterial: "USD:10",
-      balanceAgeAcceptable: "USD:10",
-      balanceMerchantAcceptable: "USD:9",
-      balanceMerchantDepositable: "USD:9",
-      feeGapEstimate: "USD:1",
+      amountRequested: "USD:10" as AmountString,
+      balanceAvailable: "USD:10" as AmountString,
+      balanceMaterial: "USD:10" as AmountString,
+      balanceAgeAcceptable: "USD:10" as AmountString,
+      balanceMerchantAcceptable: "USD:9" as AmountString,
+      balanceMerchantDepositable: "USD:9" as AmountString,
+      feeGapEstimate: "USD:1" as AmountString,
     },
     talerUri: "taler://pay/..",
 
@@ -192,9 +193,9 @@ export const NoEnoughBalanceMerchantAcceptable = tests.createExample(BaseView, {
         email: "contact@merchant.taler",
       },
       summary: "some beers",
-      amount: "USD:10",
+      amount: "USD:10" as AmountString,
     } as Partial<ContractTerms> as any,
-    amountRaw: "USD:10",
+    amountRaw: "USD:10" as AmountString,
   },
 });
 
@@ -215,13 +216,13 @@ export const NoEnoughBalanceMerchantDepositable = tests.createExample(
       transactionId: " " as TransactionIdStr,
       status: PreparePayResultType.InsufficientBalance,
       balanceDetails: {
-        amountRequested: "USD:10",
-        balanceAvailable: "USD:10",
-        balanceMaterial: "USD:10",
-        balanceAgeAcceptable: "USD:10",
-        balanceMerchantAcceptable: "USD:10",
-        balanceMerchantDepositable: "USD:9",
-        feeGapEstimate: "USD:1",
+        amountRequested: "USD:10" as AmountString,
+        balanceAvailable: "USD:10" as AmountString,
+        balanceMaterial: "USD:10" as AmountString,
+        balanceAgeAcceptable: "USD:10" as AmountString,
+        balanceMerchantAcceptable: "USD:10" as AmountString,
+        balanceMerchantDepositable: "USD:9" as AmountString,
+        feeGapEstimate: "USD:1" as AmountString,
       },
       talerUri: "taler://pay/..",
 
@@ -234,9 +235,9 @@ export const NoEnoughBalanceMerchantDepositable = tests.createExample(
           email: "contact@merchant.taler",
         },
         summary: "some beers",
-        amount: "USD:10",
+        amount: "USD:10" as AmountString,
       } as Partial<ContractTerms> as any,
-      amountRaw: "USD:10",
+      amountRaw: "USD:10" as AmountString,
     },
   },
 );
@@ -256,13 +257,13 @@ export const NoEnoughBalanceFeeGap = tests.createExample(BaseView, {
     transactionId: " " as TransactionIdStr,
     status: PreparePayResultType.InsufficientBalance,
     balanceDetails: {
-      amountRequested: "USD:10",
-      balanceAvailable: "USD:10",
-      balanceMaterial: "USD:10",
-      balanceAgeAcceptable: "USD:10",
-      balanceMerchantAcceptable: "USD:10",
-      balanceMerchantDepositable: "USD:10",
-      feeGapEstimate: "USD:1",
+      amountRequested: "USD:10" as AmountString,
+      balanceAvailable: "USD:10" as AmountString,
+      balanceMaterial: "USD:10" as AmountString,
+      balanceAgeAcceptable: "USD:10" as AmountString,
+      balanceMerchantAcceptable: "USD:10" as AmountString,
+      balanceMerchantDepositable: "USD:10" as AmountString,
+      feeGapEstimate: "USD:1" as AmountString,
     },
     talerUri: "taler://pay/..",
 
@@ -276,9 +277,9 @@ export const NoEnoughBalanceFeeGap = tests.createExample(BaseView, {
       },
       minimum_age: 18,
       summary: "some beers",
-      amount: "USD:10",
+      amount: "USD:10" as AmountString,
     } as Partial<ContractTerms> as any,
-    amountRaw: "USD:10",
+    amountRaw: "USD:10" as AmountString,
   },
 });
 
@@ -300,8 +301,8 @@ export const PaymentPossible = tests.createExample(BaseView, {
     transactionId: " " as TransactionIdStr,
     status: PreparePayResultType.PaymentPossible,
     talerUri: "taler://pay/..",
-    amountEffective: "USD:10",
-    amountRaw: "USD:10",
+    amountEffective: "USD:10" as AmountString,
+    amountRaw: "USD:10" as AmountString,
 
     contractTerms: {
       nonce: "123213123",
@@ -314,7 +315,7 @@ export const PaymentPossible = tests.createExample(BaseView, {
       pay_deadline: {
         t_s: new Date().getTime() / 1000 + 60 * 60 * 3,
       },
-      amount: "USD:10",
+      amount: "USD:10" as AmountString,
       summary: "some beers",
     } as Partial<ContractTerms> as any,
     contractTermsHash: "123456",
@@ -340,8 +341,8 @@ export const PaymentPossibleWithFee = tests.createExample(BaseView, {
     transactionId: " " as TransactionIdStr,
     status: PreparePayResultType.PaymentPossible,
     talerUri: "taler://pay/..",
-    amountEffective: "USD:10.20",
-    amountRaw: "USD:10",
+    amountEffective: "USD:10.20" as AmountString,
+    amountRaw: "USD:10" as AmountString,
 
     contractTerms: {
       nonce: "123213123",
@@ -351,7 +352,7 @@ export const PaymentPossibleWithFee = tests.createExample(BaseView, {
         website: "https://www.themerchant.taler",
         email: "contact@merchant.taler",
       },
-      amount: "USD:10",
+      amount: "USD:10" as AmountString,
       summary: "some beers",
     } as Partial<ContractTerms> as any,
     contractTermsHash: "123456",
@@ -377,8 +378,8 @@ export const TicketWithAProductList = tests.createExample(BaseView, {
     transactionId: " " as TransactionIdStr,
     status: PreparePayResultType.PaymentPossible,
     talerUri: "taler://pay/..",
-    amountEffective: "USD:10.20",
-    amountRaw: "USD:10",
+    amountEffective: "USD:10.20" as AmountString,
+    amountRaw: "USD:10" as AmountString,
 
     contractTerms: {
       nonce: "123213123",
@@ -433,8 +434,8 @@ export const TicketWithShipping = tests.createExample(BaseView, {
     transactionId: " " as TransactionIdStr,
     status: PreparePayResultType.PaymentPossible,
     talerUri: "taler://pay/..",
-    amountEffective: "USD:10.20",
-    amountRaw: "USD:10",
+    amountEffective: "USD:10.20" as AmountString,
+    amountRaw: "USD:10" as AmountString,
 
     contractTerms: {
       nonce: "123213123",
@@ -481,8 +482,8 @@ export const AlreadyConfirmedByOther = tests.createExample(BaseView, {
     transactionId: " " as TransactionIdStr,
     status: PreparePayResultType.AlreadyConfirmed,
     talerUri: "taler://pay/..",
-    amountEffective: "USD:10",
-    amountRaw: "USD:10",
+    amountEffective: "USD:10" as AmountString,
+    amountRaw: "USD:10" as AmountString,
     contractTerms: {
       merchant: {
         name: "the merchant",
diff --git a/packages/taler-wallet-webextension/src/cta/Payment/test.ts b/packages/taler-wallet-webextension/src/cta/Payment/test.ts
index e2935fc4e..213382efc 100644
--- a/packages/taler-wallet-webextension/src/cta/Payment/test.ts
+++ b/packages/taler-wallet-webextension/src/cta/Payment/test.ts
@@ -20,6 +20,7 @@
  */
 
 import {
+  AmountString,
   Amounts,
   ConfirmPayResult,
   ConfirmPayResultType,
@@ -139,10 +140,10 @@ describe("Payment CTA states", () => {
       {
         balances: [
           {
-            available: "USD:5",
+            available: "USD:5" as AmountString,
             hasPendingTransactions: false,
-            pendingIncoming: "USD:0",
-            pendingOutgoing: "USD:0",
+            pendingIncoming: "USD:0" as AmountString,
+            pendingOutgoing: "USD:0" as AmountString,
             requiresUserInput: false,
             scopeInfo: {
               currency: "USD",
@@ -199,10 +200,10 @@ describe("Payment CTA states", () => {
       {
         balances: [
           {
-            available: "USD:15",
+            available: "USD:15" as AmountString,
             hasPendingTransactions: false,
-            pendingIncoming: "USD:0",
-            pendingOutgoing: "USD:0",
+            pendingIncoming: "USD:0" as AmountString,
+            pendingOutgoing: "USD:0" as AmountString,
             requiresUserInput: false,
             scopeInfo: {
               currency: "USD",
@@ -262,10 +263,10 @@ describe("Payment CTA states", () => {
       {
         balances: [
           {
-            available: "USD:15",
+            available: "USD:15" as AmountString,
             hasPendingTransactions: false,
-            pendingIncoming: "USD:0",
-            pendingOutgoing: "USD:0",
+            pendingIncoming: "USD:0" as AmountString,
+            pendingOutgoing: "USD:0" as AmountString,
             requiresUserInput: false,
             scopeInfo: {
               currency: "USD",
@@ -323,10 +324,10 @@ describe("Payment CTA states", () => {
       {
         balances: [
           {
-            available: "USD:15",
+            available: "USD:15" as AmountString,
             hasPendingTransactions: false,
-            pendingIncoming: "USD:0",
-            pendingOutgoing: "USD:0",
+            pendingIncoming: "USD:0" as AmountString,
+            pendingOutgoing: "USD:0" as AmountString,
             requiresUserInput: false,
             scopeInfo: {
               currency: "USD",
@@ -392,10 +393,10 @@ describe("Payment CTA states", () => {
       {
         balances: [
           {
-            available: "USD:15",
+            available: "USD:15" as AmountString,
             hasPendingTransactions: false,
-            pendingIncoming: "USD:0",
-            pendingOutgoing: "USD:0",
+            pendingIncoming: "USD:0" as AmountString,
+            pendingOutgoing: "USD:0" as AmountString,
             requiresUserInput: false,
             scopeInfo: {
               currency: "USD",
@@ -480,10 +481,10 @@ describe("Payment CTA states", () => {
       {
         balances: [
           {
-            available: "USD:10",
+            available: "USD:10" as AmountString,
             hasPendingTransactions: false,
-            pendingIncoming: "USD:0",
-            pendingOutgoing: "USD:0",
+            pendingIncoming: "USD:0" as AmountString,
+            pendingOutgoing: "USD:0" as AmountString,
             requiresUserInput: false,
             scopeInfo: {
               currency: "USD",
@@ -511,10 +512,10 @@ describe("Payment CTA states", () => {
       {
         balances: [
           {
-            available: "USD:15",
+            available: "USD:15" as AmountString,
             hasPendingTransactions: false,
-            pendingIncoming: "USD:0",
-            pendingOutgoing: "USD:0",
+            pendingIncoming: "USD:0" as AmountString,
+            pendingOutgoing: "USD:0" as AmountString,
             requiresUserInput: false,
             scopeInfo: {
               currency: "USD",
diff --git a/packages/taler-wallet-webextension/src/cta/Reward/test.ts b/packages/taler-wallet-webextension/src/cta/Reward/test.ts
index 6d7bad0c8..0e378f366 100644
--- a/packages/taler-wallet-webextension/src/cta/Reward/test.ts
+++ b/packages/taler-wallet-webextension/src/cta/Reward/test.ts
@@ -19,7 +19,7 @@
  * @author Sebastian Javier Marchano (sebasjm)
  */
 
-import { Amounts } from "@gnu-taler/taler-util";
+import { AmountString, Amounts } from "@gnu-taler/taler-util";
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
 import { expect } from "chai";
 import * as tests from "@gnu-taler/web-util/testing";
@@ -66,13 +66,13 @@ describe("Tip CTA states", () => {
       accepted: false,
       exchangeBaseUrl: "exchange url",
       merchantBaseUrl: "merchant url",
-      rewardAmountEffective: "EUR:1",
+      rewardAmountEffective: "EUR:1" as AmountString,
       walletRewardId: "tip_id",
       transactionId: "txn:tip:ABC1234",
       expirationTimestamp: {
         t_s: 1,
       },
-      rewardAmountRaw: "",
+      rewardAmountRaw: "EUR:0" as AmountString,
     });
 
     const props: Props = {
@@ -110,13 +110,13 @@ describe("Tip CTA states", () => {
               accepted: true,
               exchangeBaseUrl: "exchange url",
               merchantBaseUrl: "merchant url",
-              rewardAmountEffective: "EUR:1",
+              rewardAmountEffective: "EUR:1" as AmountString,
               walletRewardId: "tip_id",
               transactionId: "txn:tip:ABC1234",
               expirationTimestamp: {
                 t_s: 1,
               },
-              rewardAmountRaw: "",
+              rewardAmountRaw: "EUR:0" as AmountString,
             },
           );
         },
@@ -140,14 +140,14 @@ describe("Tip CTA states", () => {
     handler.addWalletCallResponse(WalletApiOperation.PrepareReward, undefined, {
       exchangeBaseUrl: "exchange url",
       merchantBaseUrl: "merchant url",
-      rewardAmountEffective: "EUR:1",
+      rewardAmountEffective: "EUR:1" as AmountString,
       walletRewardId: "tip_id",
       transactionId: "txn:tip:ABC1234",
       accepted: false,
       expirationTimestamp: {
         t_s: 1,
       },
-      rewardAmountRaw: "",
+      rewardAmountRaw: "EUR:0" as AmountString,
     });
 
     const props: Props = {
@@ -188,13 +188,13 @@ describe("Tip CTA states", () => {
       accepted: true,
       exchangeBaseUrl: "exchange url",
       merchantBaseUrl: "merchant url",
-      rewardAmountEffective: "EUR:1",
+      rewardAmountEffective: "EUR:1" as AmountString,
       walletRewardId: "tip_id",
       transactionId: "txn:tip:ABC1234",
       expirationTimestamp: {
         t_s: 1,
       },
-      rewardAmountRaw: "",
+      rewardAmountRaw: "EUR:0" as AmountString,
     });
 
     const props: Props = {
diff --git a/packages/taler-wallet-webextension/src/cta/TransferCreate/index.ts b/packages/taler-wallet-webextension/src/cta/TransferCreate/index.ts
index 654b03b7f..794d2ad1c 100644
--- a/packages/taler-wallet-webextension/src/cta/TransferCreate/index.ts
+++ b/packages/taler-wallet-webextension/src/cta/TransferCreate/index.ts
@@ -14,7 +14,7 @@
  GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
  */
 
-import { AmountJson, TalerErrorDetail } from "@gnu-taler/taler-util";
+import { AmountJson, AmountString, TalerErrorDetail } from "@gnu-taler/taler-util";
 import { ErrorAlertView } from "../../components/CurrentAlerts.js";
 import { Loading } from "../../components/Loading.js";
 import { ErrorAlert } from "../../context/alert.js";
@@ -24,7 +24,7 @@ import { useComponentState } from "./state.js";
 import { ReadyView } from "./views.js";
 
 export interface Props {
-  amount: string;
+  amount: AmountString;
   onClose: () => Promise<void>;
   onSuccess: (tx: string) => Promise<void>;
 }
diff --git a/packages/taler-wallet-webextension/src/cta/TransferCreate/state.ts b/packages/taler-wallet-webextension/src/cta/TransferCreate/state.ts
index 77333e15c..297e8a56b 100644
--- a/packages/taler-wallet-webextension/src/cta/TransferCreate/state.ts
+++ b/packages/taler-wallet-webextension/src/cta/TransferCreate/state.ts
@@ -15,6 +15,7 @@
  */
 
 import {
+  AmountString,
   Amounts,
   TalerError,
   TalerErrorCode,
@@ -141,7 +142,7 @@ export function useComponentState({
 
 async function checkPeerPushDebitAndCheckMax(
   api: WxApiType,
-  amountState: string,
+  amountState: AmountString,
 ) {
   // FIXME : https://bugs.gnunet.org/view.php?id=7872
   try {
diff --git a/packages/taler-wallet-webextension/src/cta/Withdraw/test.ts b/packages/taler-wallet-webextension/src/cta/Withdraw/test.ts
index ab3b2e316..e5eaa3c14 100644
--- a/packages/taler-wallet-webextension/src/cta/Withdraw/test.ts
+++ b/packages/taler-wallet-webextension/src/cta/Withdraw/test.ts
@@ -20,6 +20,7 @@
  */
 
 import {
+  AmountString,
   Amounts,
   ExchangeEntryStatus,
   ExchangeListItem,
@@ -109,7 +110,7 @@ describe("Withdraw CTA states", () => {
       WalletApiOperation.GetWithdrawalDetailsForUri,
       undefined,
       {
-        amount: "EUR:2",
+        amount: "EUR:2" as AmountString,
         possibleExchanges: [],
       },
     );
@@ -145,7 +146,7 @@ describe("Withdraw CTA states", () => {
       WalletApiOperation.GetWithdrawalDetailsForUri,
       undefined,
       {
-        amount: "ARS:2",
+        amount: "ARS:2" as AmountString,
         possibleExchanges: exchanges,
         defaultExchangeBaseUrl: exchanges[0].exchangeBaseUrl,
       },
@@ -154,8 +155,8 @@ describe("Withdraw CTA states", () => {
       WalletApiOperation.GetWithdrawalDetailsForAmount,
       undefined,
       {
-        amountRaw: "ARS:2",
-        amountEffective: "ARS:2",
+        amountRaw: "ARS:2" as AmountString,
+        amountEffective: "ARS:2" as AmountString,
         paytoUris: ["payto://"],
         tosAccepted: true,
         ageRestrictionOptions: [],
@@ -209,7 +210,7 @@ describe("Withdraw CTA states", () => {
       WalletApiOperation.GetWithdrawalDetailsForUri,
       undefined,
       {
-        amount: "ARS:2",
+        amount: "ARS:2" as AmountString,
         possibleExchanges: exchangeWithNewTos,
         defaultExchangeBaseUrl: exchangeWithNewTos[0].exchangeBaseUrl,
       },
@@ -218,8 +219,8 @@ describe("Withdraw CTA states", () => {
       WalletApiOperation.GetWithdrawalDetailsForAmount,
       undefined,
       {
-        amountRaw: "ARS:2",
-        amountEffective: "ARS:2",
+        amountRaw: "ARS:2" as AmountString,
+        amountEffective: "ARS:2" as AmountString,
         paytoUris: ["payto://"],
         tosAccepted: false,
         ageRestrictionOptions: [],
@@ -231,7 +232,7 @@ describe("Withdraw CTA states", () => {
       WalletApiOperation.GetWithdrawalDetailsForUri,
       undefined,
       {
-        amount: "ARS:2",
+        amount: "ARS:2" as AmountString,
         possibleExchanges: exchanges,
         defaultExchangeBaseUrl: exchanges[0].exchangeBaseUrl,
       },
diff --git a/packages/taler-wallet-webextension/src/popup/Balance.stories.tsx b/packages/taler-wallet-webextension/src/popup/Balance.stories.tsx
index d2c074d32..dd8142b68 100644
--- a/packages/taler-wallet-webextension/src/popup/Balance.stories.tsx
+++ b/packages/taler-wallet-webextension/src/popup/Balance.stories.tsx
@@ -19,7 +19,7 @@
  * @author Sebastian Javier Marchano (sebasjm)
  */
 
-import { ScopeType } from "@gnu-taler/taler-util";
+import { AmountString, ScopeType } from "@gnu-taler/taler-util";
 import * as tests from "@gnu-taler/web-util/testing";
 import { BalanceView as TestedComponent } from "./BalancePage.js";
 
@@ -35,10 +35,10 @@ export const EmptyBalance = tests.createExample(TestedComponent, {
 export const SomeCoins = tests.createExample(TestedComponent, {
   balances: [
     {
-      available: "USD:10.5",
+      available: "USD:10.5" as AmountString,
       hasPendingTransactions: false,
-      pendingIncoming: "USD:0",
-      pendingOutgoing: "USD:0",
+      pendingIncoming: "USD:0" as AmountString,
+      pendingOutgoing: "USD:0" as AmountString,
       requiresUserInput: false,
       scopeInfo: {
         currency: "TESTKUDOS",
@@ -54,10 +54,10 @@ export const SomeCoins = tests.createExample(TestedComponent, {
 export const SomeCoinsInTreeCurrencies = tests.createExample(TestedComponent, {
   balances: [
     {
-      available: "EUR:1",
+      available: "EUR:1" as AmountString,
       hasPendingTransactions: false,
-      pendingIncoming: "USD:0",
-      pendingOutgoing: "USD:0",
+      pendingIncoming: "USD:0" as AmountString,
+      pendingOutgoing: "USD:0" as AmountString,
       requiresUserInput: false,
       scopeInfo: {
         currency: "TESTKUDOS",
@@ -66,10 +66,10 @@ export const SomeCoinsInTreeCurrencies = tests.createExample(TestedComponent, {
       },
     },
     {
-      available: "TESTKUDOS:2000",
+      available: "TESTKUDOS:2000" as AmountString,
       hasPendingTransactions: false,
-      pendingIncoming: "USD:0",
-      pendingOutgoing: "USD:0",
+      pendingIncoming: "USD:0" as AmountString,
+      pendingOutgoing: "USD:0" as AmountString,
       requiresUserInput: false,
       scopeInfo: {
         currency: "TESTKUDOS",
@@ -78,10 +78,10 @@ export const SomeCoinsInTreeCurrencies = tests.createExample(TestedComponent, {
       },
     },
     {
-      available: "JPY:4",
+      available: "JPY:4" as AmountString,
       hasPendingTransactions: false,
-      pendingIncoming: "EUR:15",
-      pendingOutgoing: "EUR:0",
+      pendingIncoming: "EUR:15" as AmountString,
+      pendingOutgoing: "EUR:0" as AmountString,
       requiresUserInput: false,
       scopeInfo: {
         currency: "TESTKUDOS",
@@ -97,10 +97,10 @@ export const SomeCoinsInTreeCurrencies = tests.createExample(TestedComponent, {
 export const NoCoinsInTreeCurrencies = tests.createExample(TestedComponent, {
   balances: [
     {
-      available: "EUR:3",
+      available: "EUR:3" as AmountString,
       hasPendingTransactions: false,
-      pendingIncoming: "USD:0",
-      pendingOutgoing: "USD:0",
+      pendingIncoming: "USD:0" as AmountString,
+      pendingOutgoing: "USD:0" as AmountString,
       requiresUserInput: false,
       scopeInfo: {
         currency: "TESTKUDOS",
@@ -109,10 +109,10 @@ export const NoCoinsInTreeCurrencies = tests.createExample(TestedComponent, {
       },
     },
     {
-      available: "USD:2",
+      available: "USD:2" as AmountString,
       hasPendingTransactions: false,
-      pendingIncoming: "USD:0",
-      pendingOutgoing: "USD:0",
+      pendingIncoming: "USD:0" as AmountString,
+      pendingOutgoing: "USD:0" as AmountString,
       requiresUserInput: false,
       scopeInfo: {
         currency: "TESTKUDOS",
@@ -121,10 +121,10 @@ export const NoCoinsInTreeCurrencies = tests.createExample(TestedComponent, {
       },
     },
     {
-      available: "ARS:1",
+      available: "ARS:1" as AmountString,
       hasPendingTransactions: false,
-      pendingIncoming: "EUR:15",
-      pendingOutgoing: "EUR:0",
+      pendingIncoming: "EUR:15" as AmountString,
+      pendingOutgoing: "EUR:0" as AmountString,
       requiresUserInput: false,
       scopeInfo: {
         currency: "TESTKUDOS",
@@ -140,10 +140,10 @@ export const NoCoinsInTreeCurrencies = tests.createExample(TestedComponent, {
 export const SomeCoinsInFiveCurrencies = tests.createExample(TestedComponent, {
   balances: [
     {
-      available: "USD:0",
+      available: "USD:0" as AmountString,
       hasPendingTransactions: false,
-      pendingIncoming: "USD:0",
-      pendingOutgoing: "USD:0",
+      pendingIncoming: "USD:0" as AmountString,
+      pendingOutgoing: "USD:0" as AmountString,
       requiresUserInput: false,
       scopeInfo: {
         currency: "TESTKUDOS",
@@ -152,10 +152,10 @@ export const SomeCoinsInFiveCurrencies = tests.createExample(TestedComponent, {
       },
     },
     {
-      available: "ARS:13451",
+      available: "ARS:13451" as AmountString,
       hasPendingTransactions: false,
-      pendingIncoming: "USD:0",
-      pendingOutgoing: "USD:0",
+      pendingIncoming: "USD:0" as AmountString,
+      pendingOutgoing: "USD:0" as AmountString,
       requiresUserInput: false,
       scopeInfo: {
         currency: "TESTKUDOS",
@@ -164,10 +164,10 @@ export const SomeCoinsInFiveCurrencies = tests.createExample(TestedComponent, {
       },
     },
     {
-      available: "EUR:202.02",
+      available: "EUR:202.02" as AmountString,
       hasPendingTransactions: false,
-      pendingIncoming: "EUR:0",
-      pendingOutgoing: "EUR:0",
+      pendingIncoming: "EUR:0" as AmountString,
+      pendingOutgoing: "EUR:0" as AmountString,
       requiresUserInput: false,
       scopeInfo: {
         currency: "TESTKUDOS",
@@ -176,10 +176,10 @@ export const SomeCoinsInFiveCurrencies = tests.createExample(TestedComponent, {
       },
     },
     {
-      available: "JPY:0",
+      available: "JPY:0" as AmountString,
       hasPendingTransactions: false,
-      pendingIncoming: "EUR:0",
-      pendingOutgoing: "EUR:0",
+      pendingIncoming: "EUR:0" as AmountString,
+      pendingOutgoing: "EUR:0" as AmountString,
       requiresUserInput: false,
       scopeInfo: {
         currency: "TESTKUDOS",
@@ -188,10 +188,10 @@ export const SomeCoinsInFiveCurrencies = tests.createExample(TestedComponent, {
       },
     },
     {
-      available: "JPY:51223233",
+      available: "JPY:51223233" as AmountString,
       hasPendingTransactions: false,
-      pendingIncoming: "EUR:0",
-      pendingOutgoing: "EUR:0",
+      pendingIncoming: "EUR:0" as AmountString,
+      pendingOutgoing: "EUR:0" as AmountString,
       requiresUserInput: false,
       scopeInfo: {
         currency: "TESTKUDOS",
@@ -200,10 +200,10 @@ export const SomeCoinsInFiveCurrencies = tests.createExample(TestedComponent, {
       },
     },
     {
-      available: "DEMOKUDOS:6",
+      available: "DEMOKUDOS:6" as AmountString,
       hasPendingTransactions: false,
-      pendingIncoming: "USD:0",
-      pendingOutgoing: "USD:0",
+      pendingIncoming: "USD:0" as AmountString,
+      pendingOutgoing: "USD:0" as AmountString,
       requiresUserInput: false,
       scopeInfo: {
         currency: "TESTKUDOS",
@@ -212,10 +212,10 @@ export const SomeCoinsInFiveCurrencies = tests.createExample(TestedComponent, {
       },
     },
     {
-      available: "TESTKUDOS:6",
+      available: "TESTKUDOS:6" as AmountString,
       hasPendingTransactions: false,
-      pendingIncoming: "USD:5",
-      pendingOutgoing: "USD:0",
+      pendingIncoming: "USD:5" as AmountString,
+      pendingOutgoing: "USD:0" as AmountString,
       requiresUserInput: false,
       scopeInfo: {
         currency: "TESTKUDOS",
diff --git a/packages/taler-wallet-webextension/src/wallet/AddBackupProvider/stories.tsx b/packages/taler-wallet-webextension/src/wallet/AddBackupProvider/stories.tsx
index 736de11f4..7ac92c6c9 100644
--- a/packages/taler-wallet-webextension/src/wallet/AddBackupProvider/stories.tsx
+++ b/packages/taler-wallet-webextension/src/wallet/AddBackupProvider/stories.tsx
@@ -21,6 +21,7 @@
 
 import * as tests from "@gnu-taler/web-util/testing";
 import { ConfirmProviderView, SelectProviderView } from "./views.js";
+import { AmountString } from "@gnu-taler/taler-util";
 
 export default {
   title: "add backup provider",
@@ -29,7 +30,7 @@ export default {
 export const DemoService = tests.createExample(ConfirmProviderView, {
   url: "https://sync.demo.taler.net/",
   provider: {
-    annual_fee: "KUDOS:0.1",
+    annual_fee: "KUDOS:0.1" as AmountString,
     storage_limit_in_megabytes: 20,
     version: "1",
   },
@@ -43,7 +44,7 @@ export const DemoService = tests.createExample(ConfirmProviderView, {
 export const FreeService = tests.createExample(ConfirmProviderView, {
   url: "https://sync.taler:9667/",
   provider: {
-    annual_fee: "ARS:0",
+    annual_fee: "ARS:0" as AmountString,
     storage_limit_in_megabytes: 20,
     version: "1",
   },
diff --git a/packages/taler-wallet-webextension/src/wallet/Application.tsx b/packages/taler-wallet-webextension/src/wallet/Application.tsx
index 18291a25a..4c4ba1855 100644
--- a/packages/taler-wallet-webextension/src/wallet/Application.tsx
+++ b/packages/taler-wallet-webextension/src/wallet/Application.tsx
@@ -21,6 +21,7 @@
  */
 
 import {
+  Amounts,
   TalerUri,
   TranslatedString,
   stringifyTalerUri,
@@ -426,7 +427,7 @@ export function Application(): VNode {
             }) => (
               <CallToActionTemplate title={i18n.str`Digital cash deposit`}>
                 <DepositPageCTA
-                  amountStr={amount}
+                  amountStr={Amounts.stringify(Amounts.parseOrThrow(amount))}
                   talerDepositUri={decodeURIComponent(talerUri)}
                   cancel={() => redirectTo(Pages.balance)}
                   onSuccess={(tid: string) =>
@@ -441,7 +442,7 @@ export function Application(): VNode {
             component={({ amount }: { amount: string }) => (
               <CallToActionTemplate title={i18n.str`Digital cash invoice`}>
                 <InvoiceCreatePage
-                  amount={amount}
+                  amount={Amounts.stringify(Amounts.parseOrThrow(amount))}
                   onClose={() => redirectTo(Pages.balance)}
                   onSuccess={(tid: string) =>
                     redirectTo(Pages.balanceTransaction({ tid }))
@@ -455,7 +456,7 @@ export function Application(): VNode {
             component={({ amount }: { amount: string }) => (
               <CallToActionTemplate title={i18n.str`Digital cash transfer`}>
                 <TransferCreatePage
-                  amount={amount}
+                  amount={Amounts.stringify(Amounts.parseOrThrow(amount))}
                   onClose={() => redirectTo(Pages.balance)}
                   onSuccess={(tid: string) =>
                     redirectTo(Pages.balanceTransaction({ tid }))
diff --git a/packages/taler-wallet-webextension/src/wallet/Backup.stories.tsx b/packages/taler-wallet-webextension/src/wallet/Backup.stories.tsx
index 59bcd5ce9..ae160a30c 100644
--- a/packages/taler-wallet-webextension/src/wallet/Backup.stories.tsx
+++ b/packages/taler-wallet-webextension/src/wallet/Backup.stories.tsx
@@ -28,6 +28,7 @@ import {
 import * as tests from "@gnu-taler/web-util/testing";
 import {
   AbsoluteTime,
+  AmountString,
   TalerPreciseTimestamp,
   TalerProtocolTimestamp,
 } from "@gnu-taler/taler-util";
@@ -52,7 +53,7 @@ export const LotOfProviders = tests.createExample(TestedComponent, {
         paidUntil: AbsoluteTime.fromMilliseconds(1656599921000),
       },
       terms: {
-        annualFee: "ARS:1",
+        annualFee: "ARS:1" as AmountString,
         storageLimitInMegabytes: 16,
         supportedProtocolVersion: "0.0",
       },
@@ -73,7 +74,7 @@ export const LotOfProviders = tests.createExample(TestedComponent, {
         ),
       },
       terms: {
-        annualFee: "ARS:1",
+        annualFee: "ARS:1" as AmountString,
         storageLimitInMegabytes: 16,
         supportedProtocolVersion: "0.0",
       },
@@ -88,7 +89,7 @@ export const LotOfProviders = tests.createExample(TestedComponent, {
         talerUri: "taler://",
       },
       terms: {
-        annualFee: "KUDOS:0.1",
+        annualFee: "KUDOS:0.1" as AmountString,
         storageLimitInMegabytes: 16,
         supportedProtocolVersion: "0.0",
       },
@@ -100,10 +101,10 @@ export const LotOfProviders = tests.createExample(TestedComponent, {
       paymentProposalIds: [],
       paymentStatus: {
         type: ProviderPaymentType.InsufficientBalance,
-        amount: "KUDOS:10",
+        amount: "KUDOS:10" as AmountString,
       },
       terms: {
-        annualFee: "KUDOS:0.1",
+        annualFee: "KUDOS:0.1" as AmountString,
         storageLimitInMegabytes: 16,
         supportedProtocolVersion: "0.0",
       },
@@ -116,19 +117,19 @@ export const LotOfProviders = tests.createExample(TestedComponent, {
       paymentStatus: {
         type: ProviderPaymentType.TermsChanged,
         newTerms: {
-          annualFee: "USD:2",
+          annualFee: "USD:2" as AmountString,
           storageLimitInMegabytes: 8,
           supportedProtocolVersion: "2",
         },
         oldTerms: {
-          annualFee: "USD:1",
+          annualFee: "USD:1" as AmountString,
           storageLimitInMegabytes: 16,
           supportedProtocolVersion: "1",
         },
         paidUntil: AbsoluteTime.never(),
       },
       terms: {
-        annualFee: "KUDOS:0.1",
+        annualFee: "KUDOS:0.1" as AmountString,
         storageLimitInMegabytes: 16,
         supportedProtocolVersion: "0.0",
       },
@@ -142,7 +143,7 @@ export const LotOfProviders = tests.createExample(TestedComponent, {
         type: ProviderPaymentType.Unpaid,
       },
       terms: {
-        annualFee: "KUDOS:0.1",
+        annualFee: "KUDOS:0.1" as AmountString,
         storageLimitInMegabytes: 16,
         supportedProtocolVersion: "0.0",
       },
@@ -156,7 +157,7 @@ export const LotOfProviders = tests.createExample(TestedComponent, {
         type: ProviderPaymentType.Unpaid,
       },
       terms: {
-        annualFee: "KUDOS:0.1",
+        annualFee: "KUDOS:0.1" as AmountString,
         storageLimitInMegabytes: 16,
         supportedProtocolVersion: "0.0",
       },
@@ -180,7 +181,7 @@ export const OneProvider = tests.createExample(TestedComponent, {
         paidUntil: AbsoluteTime.fromMilliseconds(1656599921000),
       },
       terms: {
-        annualFee: "ARS:1",
+        annualFee: "ARS:1" as AmountString,
         storageLimitInMegabytes: 16,
         supportedProtocolVersion: "0.0",
       },
diff --git a/packages/taler-wallet-webextension/src/wallet/DepositPage/test.ts b/packages/taler-wallet-webextension/src/wallet/DepositPage/test.ts
index 4d09d2549..5384fe4c5 100644
--- a/packages/taler-wallet-webextension/src/wallet/DepositPage/test.ts
+++ b/packages/taler-wallet-webextension/src/wallet/DepositPage/test.ts
@@ -21,6 +21,7 @@
 
 import {
   Amounts,
+  AmountString,
   DepositGroupFees,
   parsePaytoUri,
   PrepareDepositResponse,
@@ -38,8 +39,8 @@ import { useComponentState } from "./state.js";
 const currency = "EUR";
 const amount = `${currency}:0`;
 const withoutFee = (): PrepareDepositResponse => ({
-  effectiveDepositAmount: `${currency}:5`,
-  totalDepositCost: `${currency}:5`,
+  effectiveDepositAmount: `${currency}:5` as AmountString,
+  totalDepositCost: `${currency}:5` as AmountString,
   fees: {
     coin: Amounts.stringify(`${currency}:0`),
     wire: Amounts.stringify(`${currency}:0`),
@@ -48,8 +49,8 @@ const withoutFee = (): PrepareDepositResponse => ({
 });
 
 const withSomeFee = (): PrepareDepositResponse => ({
-  effectiveDepositAmount: `${currency}:5`,
-  totalDepositCost: `${currency}:5`,
+  effectiveDepositAmount: `${currency}:5` as AmountString,
+  totalDepositCost: `${currency}:5` as AmountString,
   fees: {
     coin: Amounts.stringify(`${currency}:1`),
     wire: Amounts.stringify(`${currency}:1`),
@@ -65,10 +66,10 @@ describe("DepositPage states", () => {
     handler.addWalletCallResponse(WalletApiOperation.GetBalances, undefined, {
       balances: [
         {
-          available: `${currency}:0`,
+          available: `${currency}:0` as AmountString,
           hasPendingTransactions: false,
-          pendingIncoming: `${currency}:0`,
-          pendingOutgoing: `${currency}:0`,
+          pendingIncoming: `${currency}:0` as AmountString,
+          pendingOutgoing: `${currency}:0` as AmountString,
           requiresUserInput: false,
           scopeInfo: {
             currency,
@@ -111,10 +112,10 @@ describe("DepositPage states", () => {
     handler.addWalletCallResponse(WalletApiOperation.GetBalances, undefined, {
       balances: [
         {
-          available: `${currency}:1`,
+          available: `${currency}:1` as AmountString,
           hasPendingTransactions: false,
-          pendingIncoming: `${currency}:0`,
-          pendingOutgoing: `${currency}:0`,
+          pendingIncoming: `${currency}:0` as AmountString,
+          pendingOutgoing: `${currency}:0` as AmountString,
           requiresUserInput: false,
           scopeInfo: {
             currency,
@@ -170,10 +171,10 @@ describe("DepositPage states", () => {
     handler.addWalletCallResponse(WalletApiOperation.GetBalances, undefined, {
       balances: [
         {
-          available: `${currency}:1`,
+          available: `${currency}:1` as AmountString,
           hasPendingTransactions: false,
-          pendingIncoming: `${currency}:0`,
-          pendingOutgoing: `${currency}:0`,
+          pendingIncoming: `${currency}:0` as AmountString,
+          pendingOutgoing: `${currency}:0` as AmountString,
           requiresUserInput: false,
           scopeInfo: {
             currency,
@@ -229,10 +230,10 @@ describe("DepositPage states", () => {
     handler.addWalletCallResponse(WalletApiOperation.GetBalances, undefined, {
       balances: [
         {
-          available: `${currency}:5`,
+          available: `${currency}:5` as AmountString,
           hasPendingTransactions: false,
-          pendingIncoming: `${currency}:0`,
-          pendingOutgoing: `${currency}:0`,
+          pendingIncoming: `${currency}:0` as AmountString,
+          pendingOutgoing: `${currency}:0` as AmountString,
           requiresUserInput: false,
           scopeInfo: {
             currency,
@@ -318,10 +319,10 @@ describe("DepositPage states", () => {
     handler.addWalletCallResponse(WalletApiOperation.GetBalances, undefined, {
       balances: [
         {
-          available: `${currency}:10`,
+          available: `${currency}:10` as AmountString,
           hasPendingTransactions: false,
-          pendingIncoming: `${currency}:0`,
-          pendingOutgoing: `${currency}:0`,
+          pendingIncoming: `${currency}:0` as AmountString,
+          pendingOutgoing: `${currency}:0` as AmountString,
           requiresUserInput: false,
           scopeInfo: {
             currency,
diff --git a/packages/taler-wallet-webextension/src/wallet/History.stories.tsx b/packages/taler-wallet-webextension/src/wallet/History.stories.tsx
index 1ddb24b02..9bf39b8ae 100644
--- a/packages/taler-wallet-webextension/src/wallet/History.stories.tsx
+++ b/packages/taler-wallet-webextension/src/wallet/History.stories.tsx
@@ -20,6 +20,7 @@
  */
 
 import {
+  AmountString,
   PaymentStatus,
   RefreshReason,
   ScopeType,
@@ -49,17 +50,17 @@ export default {
 
 let count = 0;
 const commonTransaction = (): TransactionCommon =>
-  ({
-    amountRaw: "USD:10",
-    amountEffective: "USD:9",
-    txState: {
-      major: TransactionMajorState.Done,
-    },
-    timestamp: TalerProtocolTimestamp.fromSeconds(
-      new Date().getTime() / 1000 - count++ * 60 * 60 * 7,
-    ),
-    transactionId: String(count),
-  } as TransactionCommon);
+({
+  amountRaw: "USD:10",
+  amountEffective: "USD:9",
+  txState: {
+    major: TransactionMajorState.Done,
+  },
+  timestamp: TalerProtocolTimestamp.fromSeconds(
+    new Date().getTime() / 1000 - count++ * 60 * 60 * 7,
+  ),
+  transactionId: String(count),
+} as TransactionCommon);
 
 const exampleData = {
   withdraw: {
@@ -76,7 +77,7 @@ const exampleData = {
   } as TransactionWithdrawal,
   payment: {
     ...commonTransaction(),
-    amountEffective: "USD:11",
+    amountEffective: "USD:11" as AmountString,
     type: TransactionType.Payment,
     posConfirmation: undefined,
     info: {
@@ -91,8 +92,8 @@ const exampleData = {
     },
     refunds: [],
     refundPending: undefined,
-    totalRefundEffective: "USD:0",
-    totalRefundRaw: "USD:0",
+    totalRefundEffective: "USD:0" as AmountString,
+    totalRefundRaw: "USD:0" as AmountString,
     proposalId: "1EMJJH8EP1NX3XF7733NCYS2DBEJW4Q2KA5KEB37MCQJQ8Q5HMC0",
     status: PaymentStatus.Accepted,
     refundQueryActive: false,
@@ -106,8 +107,8 @@ const exampleData = {
   refresh: {
     ...commonTransaction(),
     type: TransactionType.Refresh,
-    refreshInputAmount: "USD:1",
-    refreshOutputAmount: "USD:0.5",
+    refreshInputAmount: "USD:1" as AmountString,
+    refreshOutputAmount: "USD:0.5" as AmountString,
     exchangeBaseUrl: "http://exchange.taler",
     refreshReason: RefreshReason.PayMerchant,
   } as TransactionRefresh,
@@ -178,9 +179,9 @@ export const SomeBalanceWithNoTransactions = tests.createExample(
     transactions: [],
     balances: [
       {
-        available: "TESTKUDOS:10",
-        pendingIncoming: "TESTKUDOS:0",
-        pendingOutgoing: "TESTKUDOS:0",
+        available: "TESTKUDOS:10" as AmountString,
+        pendingIncoming: "TESTKUDOS:0" as AmountString,
+        pendingOutgoing: "TESTKUDOS:0" as AmountString,
         hasPendingTransactions: false,
         requiresUserInput: false,
         scopeInfo: {
@@ -197,9 +198,9 @@ export const OneSimpleTransaction = tests.createExample(TestedComponent, {
   transactions: [exampleData.withdraw],
   balances: [
     {
-      available: "USD:10",
-      pendingIncoming: "USD:0",
-      pendingOutgoing: "USD:0",
+      available: "USD:10" as AmountString,
+      pendingIncoming: "USD:0" as AmountString,
+      pendingOutgoing: "USD:0" as AmountString,
       hasPendingTransactions: false,
       requiresUserInput: false,
       scopeInfo: {
@@ -217,9 +218,9 @@ export const TwoTransactionsAndZeroBalance = tests.createExample(
     transactions: [exampleData.withdraw, exampleData.deposit],
     balances: [
       {
-        available: "USD:0",
-        pendingIncoming: "USD:0",
-        pendingOutgoing: "USD:0",
+        available: "USD:0" as AmountString,
+        pendingIncoming: "USD:0" as AmountString,
+        pendingOutgoing: "USD:0" as AmountString,
         hasPendingTransactions: false,
         requiresUserInput: false,
         scopeInfo: {
@@ -243,9 +244,9 @@ export const OneTransactionPending = tests.createExample(TestedComponent, {
   ],
   balances: [
     {
-      available: "USD:10",
-      pendingIncoming: "USD:0",
-      pendingOutgoing: "USD:0",
+      available: "USD:10" as AmountString,
+      pendingIncoming: "USD:0" as AmountString,
+      pendingOutgoing: "USD:0" as AmountString,
       hasPendingTransactions: false,
       requiresUserInput: false,
       scopeInfo: {
@@ -277,9 +278,9 @@ export const SomeTransactions = tests.createExample(TestedComponent, {
   ],
   balances: [
     {
-      available: "USD:10",
-      pendingIncoming: "USD:0",
-      pendingOutgoing: "USD:0",
+      available: "USD:10" as AmountString,
+      pendingIncoming: "USD:0" as AmountString,
+      pendingOutgoing: "USD:0" as AmountString,
       hasPendingTransactions: false,
       requiresUserInput: false,
       scopeInfo: {
@@ -370,9 +371,9 @@ export const SomeTransactionsInDifferentStates = tests.createExample(
     ],
     balances: [
       {
-        available: "USD:10",
-        pendingIncoming: "USD:0",
-        pendingOutgoing: "USD:0",
+        available: "USD:10" as AmountString,
+        pendingIncoming: "USD:0" as AmountString,
+        pendingOutgoing: "USD:0" as AmountString,
         hasPendingTransactions: false,
         requiresUserInput: false,
         scopeInfo: {
@@ -400,9 +401,9 @@ export const SomeTransactionsWithTwoCurrencies = tests.createExample(
     ],
     balances: [
       {
-        available: "USD:0",
-        pendingIncoming: "USD:0",
-        pendingOutgoing: "USD:0",
+        available: "USD:0" as AmountString,
+        pendingIncoming: "USD:0" as AmountString,
+        pendingOutgoing: "USD:0" as AmountString,
         hasPendingTransactions: false,
         requiresUserInput: false,
         scopeInfo: {
@@ -412,9 +413,9 @@ export const SomeTransactionsWithTwoCurrencies = tests.createExample(
         },
       },
       {
-        available: "TESTKUDOS:10",
-        pendingIncoming: "TESTKUDOS:0",
-        pendingOutgoing: "TESTKUDOS:0",
+        available: "TESTKUDOS:10" as AmountString,
+        pendingIncoming: "TESTKUDOS:0" as AmountString,
+        pendingOutgoing: "TESTKUDOS:0" as AmountString,
         hasPendingTransactions: false,
         requiresUserInput: false,
         scopeInfo: {
@@ -431,9 +432,9 @@ export const FiveOfficialCurrencies = tests.createExample(TestedComponent, {
   transactions: [exampleData.withdraw],
   balances: [
     {
-      available: "USD:1000",
-      pendingIncoming: "USD:0",
-      pendingOutgoing: "USD:0",
+      available: "USD:1000" as AmountString,
+      pendingIncoming: "USD:0" as AmountString,
+      pendingOutgoing: "USD:0" as AmountString,
       hasPendingTransactions: false,
       requiresUserInput: false,
       scopeInfo: {
@@ -443,9 +444,9 @@ export const FiveOfficialCurrencies = tests.createExample(TestedComponent, {
       },
     },
     {
-      available: "EUR:881",
-      pendingIncoming: "TESTKUDOS:0",
-      pendingOutgoing: "TESTKUDOS:0",
+      available: "EUR:881" as AmountString,
+      pendingIncoming: "TESTKUDOS:0" as AmountString,
+      pendingOutgoing: "TESTKUDOS:0" as AmountString,
       hasPendingTransactions: false,
       requiresUserInput: false,
       scopeInfo: {
@@ -455,9 +456,9 @@ export const FiveOfficialCurrencies = tests.createExample(TestedComponent, {
       },
     },
     {
-      available: "COL:4043000.5",
-      pendingIncoming: "TESTKUDOS:0",
-      pendingOutgoing: "TESTKUDOS:0",
+      available: "COL:4043000.5" as AmountString,
+      pendingIncoming: "TESTKUDOS:0" as AmountString,
+      pendingOutgoing: "TESTKUDOS:0" as AmountString,
       hasPendingTransactions: false,
       requiresUserInput: false,
       scopeInfo: {
@@ -467,9 +468,9 @@ export const FiveOfficialCurrencies = tests.createExample(TestedComponent, {
       },
     },
     {
-      available: "JPY:11564450.6",
-      pendingIncoming: "TESTKUDOS:0",
-      pendingOutgoing: "TESTKUDOS:0",
+      available: "JPY:11564450.6" as AmountString,
+      pendingIncoming: "TESTKUDOS:0" as AmountString,
+      pendingOutgoing: "TESTKUDOS:0" as AmountString,
       hasPendingTransactions: false,
       requiresUserInput: false,
       scopeInfo: {
@@ -479,9 +480,9 @@ export const FiveOfficialCurrencies = tests.createExample(TestedComponent, {
       },
     },
     {
-      available: "GBP:736",
-      pendingIncoming: "TESTKUDOS:0",
-      pendingOutgoing: "TESTKUDOS:0",
+      available: "GBP:736" as AmountString,
+      pendingIncoming: "TESTKUDOS:0" as AmountString,
+      pendingOutgoing: "TESTKUDOS:0" as AmountString,
       hasPendingTransactions: false,
       requiresUserInput: false,
       scopeInfo: {
@@ -499,9 +500,9 @@ export const FiveOfficialCurrenciesWithHighValue = tests.createExample(
     transactions: [exampleData.withdraw],
     balances: [
       {
-        available: "USD:881001321230000",
-        pendingIncoming: "USD:0",
-        pendingOutgoing: "USD:0",
+        available: "USD:881001321230000" as AmountString,
+        pendingIncoming: "USD:0" as AmountString,
+        pendingOutgoing: "USD:0" as AmountString,
         hasPendingTransactions: false,
         requiresUserInput: false,
         scopeInfo: {
@@ -511,9 +512,9 @@ export const FiveOfficialCurrenciesWithHighValue = tests.createExample(
         },
       },
       {
-        available: "EUR:10",
-        pendingIncoming: "TESTKUDOS:0",
-        pendingOutgoing: "TESTKUDOS:0",
+        available: "EUR:10" as AmountString,
+        pendingIncoming: "TESTKUDOS:0" as AmountString,
+        pendingOutgoing: "TESTKUDOS:0" as AmountString,
         hasPendingTransactions: false,
         requiresUserInput: false,
         scopeInfo: {
@@ -523,9 +524,9 @@ export const FiveOfficialCurrenciesWithHighValue = tests.createExample(
         },
       },
       {
-        available: "COL:443000123123000.5123123",
-        pendingIncoming: "TESTKUDOS:0",
-        pendingOutgoing: "TESTKUDOS:0",
+        available: "COL:443000123123000.5123123" as AmountString,
+        pendingIncoming: "TESTKUDOS:0" as AmountString,
+        pendingOutgoing: "TESTKUDOS:0" as AmountString,
         hasPendingTransactions: false,
         scopeInfo: {
           currency: "Ásd",
@@ -535,9 +536,9 @@ export const FiveOfficialCurrenciesWithHighValue = tests.createExample(
         requiresUserInput: false,
       },
       {
-        available: "JPY:1564450000000.6123123",
-        pendingIncoming: "TESTKUDOS:0",
-        pendingOutgoing: "TESTKUDOS:0",
+        available: "JPY:1564450000000.6123123" as AmountString,
+        pendingIncoming: "TESTKUDOS:0" as AmountString,
+        pendingOutgoing: "TESTKUDOS:0" as AmountString,
         hasPendingTransactions: false,
         requiresUserInput: false,
         scopeInfo: {
@@ -547,9 +548,9 @@ export const FiveOfficialCurrenciesWithHighValue = tests.createExample(
         },
       },
       {
-        available: "GBP:736001231231200.23123",
-        pendingIncoming: "TESTKUDOS:0",
-        pendingOutgoing: "TESTKUDOS:0",
+        available: "GBP:736001231231200.23123" as AmountString,
+        pendingIncoming: "TESTKUDOS:0" as AmountString,
+        pendingOutgoing: "TESTKUDOS:0" as AmountString,
         hasPendingTransactions: false,
         requiresUserInput: false,
         scopeInfo: {
@@ -571,9 +572,9 @@ export const PeerToPeer = tests.createExample(TestedComponent, {
   ],
   balances: [
     {
-      available: "USD:10",
-      pendingIncoming: "USD:0",
-      pendingOutgoing: "USD:0",
+      available: "USD:10" as AmountString,
+      pendingIncoming: "USD:0" as AmountString,
+      pendingOutgoing: "USD:0" as AmountString,
       hasPendingTransactions: false,
       requiresUserInput: false,
       scopeInfo: {
diff --git a/packages/taler-wallet-webextension/src/wallet/ProviderDetail.stories.tsx b/packages/taler-wallet-webextension/src/wallet/ProviderDetail.stories.tsx
index fbaa0b0ea..f81a86b9d 100644
--- a/packages/taler-wallet-webextension/src/wallet/ProviderDetail.stories.tsx
+++ b/packages/taler-wallet-webextension/src/wallet/ProviderDetail.stories.tsx
@@ -21,6 +21,7 @@
 
 import {
   AbsoluteTime,
+  AmountString,
   TalerPreciseTimestamp,
   TalerProtocolTimestamp,
 } from "@gnu-taler/taler-util";
@@ -53,7 +54,7 @@ export const Active = tests.createExample(TestedComponent, {
       paidUntil: AbsoluteTime.fromMilliseconds(1656599921000),
     },
     terms: {
-      annualFee: "EUR:1",
+      annualFee: "EUR:1" as AmountString,
       storageLimitInMegabytes: 16,
       supportedProtocolVersion: "0.0",
     },
@@ -84,7 +85,7 @@ export const ActiveErrorSync = tests.createExample(TestedComponent, {
       message: "message",
     },
     terms: {
-      annualFee: "EUR:1",
+      annualFee: "EUR:1" as AmountString,
       storageLimitInMegabytes: 16,
       supportedProtocolVersion: "0.0",
     },
@@ -111,7 +112,7 @@ export const ActiveBackupProblemUnreadable = tests.createExample(
         type: "backup-unreadable",
       },
       terms: {
-        annualFee: "EUR:1",
+        annualFee: "EUR:1" as AmountString,
         storageLimitInMegabytes: 16,
         supportedProtocolVersion: "0.0",
       },
@@ -140,7 +141,7 @@ export const ActiveBackupProblemDevice = tests.createExample(TestedComponent, {
       backupTimestamp: AbsoluteTime.fromMilliseconds(1656599921000),
     },
     terms: {
-      annualFee: "EUR:1",
+      annualFee: "EUR:1" as AmountString,
       storageLimitInMegabytes: 16,
       supportedProtocolVersion: "0.0",
     },
@@ -157,7 +158,7 @@ export const InactiveUnpaid = tests.createExample(TestedComponent, {
       type: ProviderPaymentType.Unpaid,
     },
     terms: {
-      annualFee: "EUR:0.1",
+      annualFee: "EUR:0.1" as AmountString,
       storageLimitInMegabytes: 16,
       supportedProtocolVersion: "0.0",
     },
@@ -174,10 +175,10 @@ export const InactiveInsufficientBalance = tests.createExample(
       paymentProposalIds: [],
       paymentStatus: {
         type: ProviderPaymentType.InsufficientBalance,
-        amount: "EUR:123",
+        amount: "EUR:123" as AmountString,
       },
       terms: {
-        annualFee: "EUR:0.1",
+        annualFee: "EUR:0.1" as AmountString,
         storageLimitInMegabytes: 16,
         supportedProtocolVersion: "0.0",
       },
@@ -196,7 +197,7 @@ export const InactivePending = tests.createExample(TestedComponent, {
       talerUri: "taler://pay/sad",
     },
     terms: {
-      annualFee: "EUR:0.1",
+      annualFee: "EUR:0.1" as AmountString,
       storageLimitInMegabytes: 16,
       supportedProtocolVersion: "0.0",
     },
@@ -213,18 +214,18 @@ export const ActiveTermsChanged = tests.createExample(TestedComponent, {
       type: ProviderPaymentType.TermsChanged,
       paidUntil: AbsoluteTime.fromMilliseconds(1656599921000),
       newTerms: {
-        annualFee: "EUR:10",
+        annualFee: "EUR:10" as AmountString,
         storageLimitInMegabytes: 8,
         supportedProtocolVersion: "0.0",
       },
       oldTerms: {
-        annualFee: "EUR:0.1",
+        annualFee: "EUR:0.1" as AmountString,
         storageLimitInMegabytes: 16,
         supportedProtocolVersion: "0.0",
       },
     },
     terms: {
-      annualFee: "EUR:0.1",
+      annualFee: "EUR:0.1" as AmountString,
       storageLimitInMegabytes: 16,
       supportedProtocolVersion: "0.0",
     },
diff --git a/packages/taler-wallet-webextension/src/wallet/Transaction.stories.tsx b/packages/taler-wallet-webextension/src/wallet/Transaction.stories.tsx
index f1ae84ed3..09f7c4dc1 100644
--- a/packages/taler-wallet-webextension/src/wallet/Transaction.stories.tsx
+++ b/packages/taler-wallet-webextension/src/wallet/Transaction.stories.tsx
@@ -21,6 +21,7 @@
 
 import {
   AbsoluteTime,
+  AmountString,
   PaymentStatus,
   RefreshReason,
   TalerPreciseTimestamp,
@@ -60,8 +61,8 @@ export default {
 
 const commonTransaction: TransactionCommon = {
   error: undefined,
-  amountRaw: "KUDOS:11",
-  amountEffective: "KUDOS:9.2",
+  amountRaw: "KUDOS:11" as AmountString,
+  amountEffective: "KUDOS:9.2" as AmountString,
   txState: {
     major: TransactionMajorState.Done,
   },
@@ -91,7 +92,7 @@ const exampleData = {
   } as TransactionWithdrawal,
   payment: {
     ...commonTransaction,
-    amountEffective: "KUDOS:12",
+    amountEffective: "KUDOS:12" as AmountString,
     type: TransactionType.Payment,
     posConfirmation: undefined,
     info: {
@@ -113,8 +114,8 @@ const exampleData = {
     },
     refunds: [],
     refundPending: undefined,
-    totalRefundEffective: "KUDOS:0",
-    totalRefundRaw: "KUDOS:0",
+    totalRefundEffective: "KUDOS:0" as AmountString,
+    totalRefundRaw: "KUDOS:0" as AmountString,
     proposalId: "1EMJJH8EP1NX3XF7733NCYS2DBEJW4Q2KA5KEB37MCQJQ8Q5HMC0",
     status: PaymentStatus.Accepted,
     refundQueryActive: false,
@@ -131,8 +132,8 @@ const exampleData = {
   refresh: {
     ...commonTransaction,
     type: TransactionType.Refresh,
-    refreshInputAmount: "KUDOS:1",
-    refreshOutputAmount: "KUDOS:0.5",
+    refreshInputAmount: "KUDOS:1" as AmountString,
+    refreshOutputAmount: "KUDOS:0.5" as AmountString,
     exchangeBaseUrl: "http://exchange.taler",
     refreshReason: RefreshReason.Manual,
   } as TransactionRefresh,
@@ -358,14 +359,14 @@ export const PaymentError = tests.createExample(TestedComponent, {
 export const PaymentWithRefund = tests.createExample(TestedComponent, {
   transaction: {
     ...exampleData.payment,
-    amountRaw: "KUDOS:12",
-    totalRefundEffective: "KUDOS:1",
-    totalRefundRaw: "KUDOS:1",
+    amountRaw: "KUDOS:12" as AmountString,
+    totalRefundEffective: "KUDOS:1" as AmountString,
+    totalRefundRaw: "KUDOS:1" as AmountString,
     refunds: [
       {
         transactionId: "1123123",
-        amountRaw: "KUDOS:1",
-        amountEffective: "KUDOS:1",
+        amountRaw: "KUDOS:1" as AmountString,
+        amountEffective: "KUDOS:1" as AmountString,
         timestamp: TalerProtocolTimestamp.fromSeconds(1546546544),
       },
     ],
@@ -375,7 +376,7 @@ export const PaymentWithRefund = tests.createExample(TestedComponent, {
 export const PaymentWithDeliveryDate = tests.createExample(TestedComponent, {
   transaction: {
     ...exampleData.payment,
-    amountRaw: "KUDOS:12",
+    amountRaw: "KUDOS:12" as AmountString,
     info: {
       ...exampleData.payment.info,
       // delivery_date: {
@@ -388,7 +389,7 @@ export const PaymentWithDeliveryDate = tests.createExample(TestedComponent, {
 export const PaymentWithDeliveryAddr = tests.createExample(TestedComponent, {
   transaction: {
     ...exampleData.payment,
-    amountRaw: "KUDOS:12",
+    amountRaw: "KUDOS:12" as AmountString,
     info: {
       ...exampleData.payment.info,
       // delivery_location: {
@@ -404,7 +405,7 @@ export const PaymentWithDeliveryAddr = tests.createExample(TestedComponent, {
 export const PaymentWithDeliveryFull = tests.createExample(TestedComponent, {
   transaction: {
     ...exampleData.payment,
-    amountRaw: "KUDOS:12",
+    amountRaw: "KUDOS:12" as AmountString,
     info: {
       ...exampleData.payment.info,
       // delivery_date: {
@@ -423,35 +424,35 @@ export const PaymentWithDeliveryFull = tests.createExample(TestedComponent, {
 export const PaymentWithRefundPending = tests.createExample(TestedComponent, {
   transaction: {
     ...exampleData.payment,
-    amountRaw: "KUDOS:12",
-    refundPending: "KUDOS:3",
-    totalRefundEffective: "KUDOS:1",
-    totalRefundRaw: "KUDOS:1",
+    amountRaw: "KUDOS:12" as AmountString,
+    refundPending: "KUDOS:3" as AmountString,
+    totalRefundEffective: "KUDOS:1" as AmountString,
+    totalRefundRaw: "KUDOS:1" as AmountString,
   },
 });
 
 export const PaymentWithFeeAndRefund = tests.createExample(TestedComponent, {
   transaction: {
     ...exampleData.payment,
-    amountRaw: "KUDOS:11",
-    totalRefundEffective: "KUDOS:1",
-    totalRefundRaw: "KUDOS:1",
+    amountRaw: "KUDOS:11" as AmountString,
+    totalRefundEffective: "KUDOS:1" as AmountString,
+    totalRefundRaw: "KUDOS:1" as AmountString,
   },
 });
 
 export const PaymentWithFeeAndRefundFee = tests.createExample(TestedComponent, {
   transaction: {
     ...exampleData.payment,
-    amountRaw: "KUDOS:11",
-    totalRefundEffective: "KUDOS:1",
-    totalRefundRaw: "KUDOS:2",
+    amountRaw: "KUDOS:11" as AmountString,
+    totalRefundEffective: "KUDOS:1" as AmountString,
+    totalRefundRaw: "KUDOS:2" as AmountString,
   },
 });
 
 export const PaymentWithoutFee = tests.createExample(TestedComponent, {
   transaction: {
     ...exampleData.payment,
-    amountRaw: "KUDOS:12",
+    amountRaw: "KUDOS:12" as AmountString,
   },
 });
 
@@ -537,8 +538,8 @@ export const DepositTalerBank = tests.createExample(TestedComponent, {
 export const DepositBitcoin = tests.createExample(TestedComponent, {
   transaction: {
     ...exampleData.deposit,
-    amountRaw: "BITCOINBTC:0.0000011",
-    amountEffective: "BITCOINBTC:0.00000092",
+    amountRaw: "BITCOINBTC:0.0000011" as AmountString,
+    amountEffective: "BITCOINBTC:0.00000092" as AmountString,
     targetPaytoUri:
       "payto://bitcoin/bcrt1q6ps8qs6v8tkqrnru4xqqqa6rfwcx5ufpdfqht4?amount=BTC:0.1&subject=0ZSX8SH0M30KHX8K3Y1DAMVGDQV82XEF9DG1HC4QMQ3QWYT4AF00",
   },
diff --git a/packages/taler-wallet-webextension/src/wallet/Transaction.tsx b/packages/taler-wallet-webextension/src/wallet/Transaction.tsx
index 3b76558ce..422695367 100644
--- a/packages/taler-wallet-webextension/src/wallet/Transaction.tsx
+++ b/packages/taler-wallet-webextension/src/wallet/Transaction.tsx
@@ -18,6 +18,7 @@ import {
   AbsoluteTime,
   AmountJson,
   Amounts,
+  AmountString,
   Location,
   MerchantInfo,
   NotificationType,
@@ -1655,7 +1656,7 @@ function RefundDetails({ amount }: { amount: AmountWithFee }): VNode {
 
 type AmountAmountByWireTransferByWire = {
   id: string;
-  amount: string;
+  amount: AmountString;
 }[];
 
 function calculateAmountByWireTransfer(