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diff --git a/packages/taler-harness/src/integrationtests/test-libeufin-c5x.ts b/packages/taler-harness/src/integrationtests/test-libeufin-c5x.ts
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+++ b/packages/taler-harness/src/integrationtests/test-libeufin-c5x.ts
@@ -0,0 +1,147 @@
+/*
+ This file is part of GNU Taler
+ (C) 2020 Taler Systems S.A.
+
+ GNU Taler is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+/**
+ * Imports.
+ */
+import { GlobalTestState } from "../harness/harness.js";
+import {
+  launchLibeufinServices,
+  LibeufinNexusApi,
+  NexusUserBundle,
+  SandboxUserBundle,
+} from "../harness/libeufin.js";
+
+/**
+ * This test checks how the C52 and C53 coordinate.  It'll test
+ * whether fresh transactions stop showing as C52 after they get
+ * included in a bank statement.
+ */
+export async function runLibeufinC5xTest(t: GlobalTestState) {
+  /**
+   * User saltetd "01"
+   */
+  const user01nexus = new NexusUserBundle(
+    "01",
+    "http://localhost:5010/ebicsweb",
+  );
+  const user01sandbox = new SandboxUserBundle("01");
+
+  /**
+   * User saltetd "02".
+   */
+  const user02nexus = new NexusUserBundle(
+    "02",
+    "http://localhost:5010/ebicsweb",
+  );
+  const user02sandbox = new SandboxUserBundle("02");
+
+  /**
+   * Launch Sandbox and Nexus.
+   */
+  const libeufinServices = await launchLibeufinServices(
+    t,
+    [user01nexus, user02nexus],
+    [user01sandbox, user02sandbox],
+    ["twg"],
+  );
+
+  // Check that C52 and C53 have zero entries.
+
+  // C52
+  await LibeufinNexusApi.fetchTransactions(
+    libeufinServices.libeufinNexus,
+    user01nexus.localAccountName,
+    "all", // range
+    "report", // level
+  );
+  // C53
+  await LibeufinNexusApi.fetchTransactions(
+    libeufinServices.libeufinNexus,
+    user01nexus.localAccountName,
+    "all", // range
+    "statement", // level
+  );
+  const nexusTxs = await LibeufinNexusApi.getAccountTransactions(
+    libeufinServices.libeufinNexus,
+    user01nexus.localAccountName,
+  );
+  t.assertTrue(nexusTxs.data["transactions"].length == 0);
+
+  // Addressing one payment to user 01
+  await libeufinServices.libeufinSandbox.makeTransaction(
+    user02sandbox.ebicsBankAccount.label, // debit
+    user01sandbox.ebicsBankAccount.label, // credit
+    "EUR:10",
+    "first payment",
+  );
+
+  let expectOne = await LibeufinNexusApi.fetchTransactions(
+    libeufinServices.libeufinNexus,
+    user01nexus.localAccountName,
+    "all", // range
+    "report", // C52
+  );
+  t.assertTrue(expectOne.data.newTransactions == 1);
+  t.assertTrue(expectOne.data.downloadedTransactions == 1);
+
+  /* Expect zero payments being downloaded because the
+   * previous request consumed already the one pending
+   * payment.
+   */
+  let expectZero = await LibeufinNexusApi.fetchTransactions(
+    libeufinServices.libeufinNexus,
+    user01nexus.localAccountName,
+    "all", // range
+    "report", // C52
+  );
+  t.assertTrue(expectZero.data.newTransactions == 0);
+  t.assertTrue(expectZero.data.downloadedTransactions == 0);
+
+  /**
+   * A statement should still account zero payments because
+   * so far the payment made before is still pending. 
+   */
+  expectZero = await LibeufinNexusApi.fetchTransactions(
+    libeufinServices.libeufinNexus,
+    user01nexus.localAccountName,
+    "all", // range
+    "statement", // C53
+  );
+  t.assertTrue(expectZero.data.newTransactions == 0);
+  t.assertTrue(expectZero.data.downloadedTransactions == 0);
+
+  /**
+   * Ticking now.  That books any pending transaction.
+   */
+  await libeufinServices.libeufinSandbox.c53tick();
+
+  /**
+   * A statement is now expected to download the transaction,
+   * although that got already ingested along the report
+   * earlier.  Thus the transaction counts as downloaded but
+   * not as new.
+   */
+  expectOne = await LibeufinNexusApi.fetchTransactions(
+    libeufinServices.libeufinNexus,
+    user01nexus.localAccountName,
+    "all", // range
+    "statement", // C53
+  );
+  t.assertTrue(expectOne.data.downloadedTransactions == 1);
+  t.assertTrue(expectOne.data.newTransactions == 0);
+}
+runLibeufinC5xTest.suites = ["libeufin"];