working on #3888

9 files changed, 428 insertions, 32 deletions

diff --git a/src/include/taler_crypto_lib.h b/src/include/taler_crypto_lib.h
index 16240e5a3..87020fbbe 100644
--- a/src/include/taler_crypto_lib.h
+++ b/src/include/taler_crypto_lib.h
@@ -428,6 +428,37 @@ struct TALER_RefreshLinkDecrypted
 };
 
 
+/**
+ * Binary information encoded in Crockford's Base32 in wire transfer
+ * subjects of transfers from Taler to a merchant.  The actual value
+ * is chosen by the mint and has no particular semantics, other than
+ * being unique so that the mint can lookup details about the wire
+ * transfer when needed.
+ */
+struct TALER_WireTransferIdentifierP
+{
+
+  /**
+   * Raw value.  Note that typical payment systems (SEPA, ACH) support
+   * at least two lines of 27 ASCII characters to encode a transaction
+   * subject or "details", for a total of 54 characters.  (The payment
+   * system protocols often support more lines, but the forms presented
+   * to customers are usually limited to 54 characters.)
+   *
+   * With a Base32-encoding of 5 bit per character, this gives us 270
+   * bits or (rounded down) 33 bytes.  So we use the first 32 bytes to
+   * encode the actual value (i.e. a 256-bit / 32-byte public key or
+   * a hash code), and the last byte for a minimalistic checksum.
+   */
+  uint8_t raw[32];
+
+  /**
+   * Checksum using CRC8 over the @e raw data.
+   */
+  uint8_t crc8;
+};
+
+
 GNUNET_NETWORK_STRUCT_END
 
 
diff --git a/src/include/taler_mintdb_plugin.h b/src/include/taler_mintdb_plugin.h
index d9a1c6c85..a4a94faa9 100644
--- a/src/include/taler_mintdb_plugin.h
+++ b/src/include/taler_mintdb_plugin.h
@@ -571,7 +571,7 @@ typedef void
 /**
  * Function called with the results of the lookup of the
  * wire transfer identifier information.
- * 
+ *
  * @param cls closure
  * @param wtid base32-encoded wire transfer identifier, NULL
  *         if the transaction was not yet done
@@ -585,6 +585,31 @@ typedef void
 				    const char *wtid,
 				    struct GNUNET_TIME_Absolute execution_time);
 
+
+/**
+ * Function called with the results of the lookup of the
+ * transaction data associated with a wire transfer identifier.
+ *
+ * @param cls closure
+ * @param merchant_pub public key of the merchant (should be same for all callbacks with the same @e cls)
+ * @param h_wire hash of wire transfer details of the merchant (should be same for all callbacks with the same @e cls)
+ * @param h_contract which contract was this payment about
+ * @param transaction_id merchant's transaction ID for the payment
+ * @param coin_pub which public key was this payment about
+ * @param deposit_value amount contributed by this coin in total
+ * @param deposit_fee deposit fee charged by mint for this coin
+ */
+typedef void
+(*TALER_MINTDB_TransactionDataCallback)(void *cls,
+                                        const struct TALER_MerchantPublicKeyP *merchant_pub,
+                                        const struct GNUNET_HashCode *h_wire,
+                                        const struct GNUNET_HashCode *h_contract,
+                                        uint64_t transaction_id,
+                                        const struct TALER_CoinSpendPublicKeyP *coin_pub,
+                                        const struct TALER_Amount *deposit_value,
+                                        const struct TALER_Amount *deposit_fee);
+
+
 /**
  * @brief The plugin API, returned from the plugin's "init" function.
  * The argument given to "init" is simply a configuration handle.
@@ -1195,10 +1220,29 @@ struct TALER_MINTDB_Plugin
 
 
   /**
+   * Lookup the list of Taler transactions that was aggregated
+   * into a wire transfer by the respective @a raw_wtid.
+   *
+   * @param cls the @e cls of this struct with the plugin-specific state
+   * @param raw_wtid the raw wire transfer identifier we used
+   * @param raw_len number of bytes in @a raw_wtid (right now always 32)
+   * @param cb function to call on each transaction found
+   * @param cb_cls closure for @a cb
+   * @return #GNUNET_OK on success, #GNUNET_SYSERR on database errors
+   */
+  int
+  (*lookup_wire_transactions) (void *cls,
+                               const void *raw_wtid,
+                               size_t raw_len,
+                               TALER_MINTDB_TransactionDataCallback cb,
+                               void *cb_cls);
+
+
+  /**
    * Try to find the wire transfer details for a deposit operation.
    * If we did not execute the deposit yet, return when it is supposed
    * to be executed.
-   * 
+   *
    * @param cls closure
    * @param h_contract hash of the contract
    * @param h_wire hash of merchant wire details
diff --git a/src/include/taler_signatures.h b/src/include/taler_signatures.h
index fb2916cff..ca8cf2dec 100644
--- a/src/include/taler_signatures.h
+++ b/src/include/taler_signatures.h
@@ -106,6 +106,11 @@
  */
 #define TALER_SIGNATURE_MINT_WIRE_TYPES 1036
 
+/**
+ * Signature where the Mint confirms the /deposit/wtid response.
+ */
+#define TALER_SIGNATURE_MINT_CONFIRM_WIRE 1036
+
 
 /*********************/
 /* Wallet signatures */
@@ -863,6 +868,20 @@ struct TALER_ContractPS
 };
 
 
+/**
+ * Details affirmed by the mint about a wire transfer the mint
+ * claims to have done with respect to a deposit operation.
+ */
+struct TALER_ConfirmWirePS
+{
+  /**
+   * Purpose header for the signature over the contract with
+   * purpose #TALER_SIGNATURE_MINT_CONFIRM_WIRE.
+   */
+  struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
+
+
+};
 
 GNUNET_NETWORK_STRUCT_END
 
diff --git a/src/mint/taler-mint-httpd_db.c b/src/mint/taler-mint-httpd_db.c
index 2b4ade595..1b0af585d 100644
--- a/src/mint/taler-mint-httpd_db.c
+++ b/src/mint/taler-mint-httpd_db.c
@@ -1552,9 +1552,189 @@ TMH_DB_execute_admin_add_incoming (struct MHD_Connection *connection,
 
 
 /**
+ * Closure for #handle_transaction_data.
+ */
+struct WtidTransactionContext
+{
+
+  /**
+   * Total amount of the wire transfer, as calculated by
+   * summing up the individual amounts. To be rounded down
+   * to calculate the real transfer amount at the end.
+   * Only valid if @e is_valid is #GNUNET_YES.
+   */
+  struct TALER_Amount total;
+
+  /**
+   * Public key of the merchant, only valid if @e is_valid
+   * is #GNUNET_YES.
+   */
+  struct TALER_MerchantPublicKeyP merchant_pub;
+
+  /**
+   * Hash of the wire details of the merchant (identical for all
+   * deposits), only valid if @e is_valid is #GNUNET_YES.
+   */
+  struct GNUNET_HashCode h_wire;
+
+  /**
+   * JSON array with details about the individual deposits.
+   */
+  json_t *deposits;
+
+  /**
+   * Initially #GNUNET_NO, if we found no deposits so far.  Set to
+   * #GNUNET_YES if we got transaction data, and the database replies
+   * remained consistent with respect to @e merchant_pub and @e h_wire
+   * (as they should).  Set to #GNUNET_SYSERR if we encountered an
+   * internal error.
+   */
+  int is_valid;
+
+};
+
+
+/**
+ * Function called with the results of the lookup of the
+ * transaction data for the given wire transfer identifier.
+ *
+ * @param cls our context for transmission
+ * @param merchant_pub public key of the merchant (should be same for all callbacks with the same @e cls)
+ * @param h_wire hash of wire transfer details of the merchant (should be same for all callbacks with the same @e cls)
+ * @param h_contract which contract was this payment about
+ * @param transaction_id merchant's transaction ID for the payment
+ * @param coin_pub which public key was this payment about
+ * @param deposit_value amount contributed by this coin in total
+ * @param deposit_fee deposit fee charged by mint for this coin
+ */
+static void
+handle_transaction_data (void *cls,
+                         const struct TALER_MerchantPublicKeyP *merchant_pub,
+                         const struct GNUNET_HashCode *h_wire,
+                         const struct GNUNET_HashCode *h_contract,
+                         uint64_t transaction_id,
+                         const struct TALER_CoinSpendPublicKeyP *coin_pub,
+                         const struct TALER_Amount *deposit_value,
+                         const struct TALER_Amount *deposit_fee)
+{
+  struct WtidTransactionContext *ctx = cls;
+  struct TALER_Amount delta;
+
+  if (GNUNET_SYSERR == ctx->is_valid)
+    return;
+  if (GNUNET_NO == ctx->is_valid)
+  {
+    ctx->merchant_pub = *merchant_pub;
+    ctx->h_wire = *h_wire;
+    ctx->is_valid = GNUNET_YES;
+    if (GNUNET_OK !=
+        TALER_amount_subtract (&ctx->total,
+                               deposit_value,
+                               deposit_fee))
+    {
+      GNUNET_break (0);
+      ctx->is_valid = GNUNET_SYSERR;
+      return;
+    }
+  }
+  else
+  {
+    if ( (0 != memcmp (&ctx->merchant_pub,
+                       merchant_pub,
+                       sizeof (struct TALER_MerchantPublicKeyP))) ||
+         (0 != memcmp (&ctx->h_wire,
+                       h_wire,
+                       sizeof (struct GNUNET_HashCode))) )
+    {
+      GNUNET_break (0);
+      ctx->is_valid = GNUNET_SYSERR;
+      return;
+    }
+    if (GNUNET_OK !=
+        TALER_amount_subtract (&delta,
+                               deposit_value,
+                               deposit_fee))
+    {
+      GNUNET_break (0);
+      ctx->is_valid = GNUNET_SYSERR;
+      return;
+    }
+    if (GNUNET_OK !=
+        TALER_amount_add (&ctx->total,
+                          &ctx->total,
+                          &delta))
+    {
+      GNUNET_break (0);
+      ctx->is_valid = GNUNET_SYSERR;
+      return;
+    }
+  }
+  /* NOTE: We usually keep JSON stuff out of the _DB file, and this
+     is also ugly if we ever add signatures over this data. (#4135) */
+  json_array_append (ctx->deposits,
+                     json_pack ("{s:o, s:o, s:o, s:I, s:o}",
+                                "deposit_value", TALER_json_from_amount (deposit_value),
+                                "deposit_fee", TALER_json_from_amount (deposit_fee),
+                                "H_contract", TALER_json_from_data (h_contract,
+                                                                    sizeof (struct GNUNET_HashCode)),
+                                "transaction_id", (json_int_t) transaction_id,
+                                "coin_pub", TALER_json_from_data (coin_pub,
+                                                                  sizeof (struct TALER_CoinSpendPublicKeyP))));
+}
+
+
+/**
+ * Execute a "/wire/deposits".  Returns the transaction information
+ * associated with the given wire transfer identifier.
+ *
+ * @param connection the MHD connection to handle
+ * @param wtid wire transfer identifier to resolve
+ * @return MHD result code
+ */
+int
+TMH_DB_execute_wire_deposits (struct MHD_Connection *connection,
+                             const struct TALER_WireTransferIdentifierP *wtid)
+{
+  int ret;
+  struct WtidTransactionContext ctx;
+
+  ctx.is_valid = GNUNET_NO;
+  ctx.deposits = json_array ();
+  ret = TMH_plugin->lookup_wire_transactions (TMH_plugin->cls,
+                                              &wtid->raw,
+                                              sizeof (wtid->raw),
+                                              &handle_transaction_data,
+                                              &ctx);
+  if (GNUNET_SYSERR == ret)
+  {
+    GNUNET_break (0);
+    json_decref (ctx.deposits);
+    return TMH_RESPONSE_reply_internal_db_error (connection);
+  }
+  if (GNUNET_SYSERR == ctx.is_valid)
+  {
+    GNUNET_break (0);
+    json_decref (ctx.deposits);
+    return TMH_RESPONSE_reply_internal_db_error (connection);
+  }
+  if (GNUNET_NO == ctx.is_valid)
+  {
+    json_decref (ctx.deposits);
+    return TMH_RESPONSE_reply_arg_unknown (connection,
+                                           "wtid");
+  }
+  return TMH_RESPONSE_reply_wire_deposit_details (connection,
+                                                  &ctx.total,
+                                                  &ctx.merchant_pub,
+                                                  &ctx.h_wire,
+                                                  ctx.deposits);
+}
+
+
+/**
  * Closure for #handle_wtid_data.
  */
-struct DepositWtidContext 
+struct DepositWtidContext
 {
 
   /**
@@ -1572,7 +1752,7 @@ struct DepositWtidContext
 /**
  * Function called with the results of the lookup of the
  * wire transfer identifier information.
- * 
+ *
  * @param cls our context for transmission
  * @param wtid base32-encoded wire transfer identifier, NULL
  *         if the transaction was not yet done
@@ -1590,16 +1770,19 @@ handle_wtid_data (void *cls,
 
   if (NULL == wtid)
   {
-    if (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us == 
+    if (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us ==
 	execution_time.abs_value_us)
       ctx->res = TMH_RESPONSE_reply_deposit_unknown (ctx->connection);
     else
-      ctx->res = TMH_RESPONSE_reply_deposit_pending (ctx->connection);
+      ctx->res = TMH_RESPONSE_reply_deposit_pending (ctx->connection,
+                                                     execution_time);
   }
   else
   {
-    ctx->res = TMH_RESPONSE_reply_deposit_wtid (ctx->connection);
-  }  
+    ctx->res = TMH_RESPONSE_reply_deposit_wtid (ctx->connection,
+                                                wtid,
+                                                execution_time);
+  }
 }
 
 
@@ -1627,6 +1810,7 @@ TMH_DB_execute_deposit_wtid (struct MHD_Connection *connection,
   struct DepositWtidContext ctx;
 
   ctx.connection = connection;
+  ctx.res = MHD_NO; /* this value should never be read... */
   ret = TMH_plugin->wire_lookup_deposit_wtid (TMH_plugin->cls,
 					      h_contract,
 					      h_wire,
@@ -1634,7 +1818,7 @@ TMH_DB_execute_deposit_wtid (struct MHD_Connection *connection,
 					      merchant_pub,
 					      transaction_id,
 					      &handle_wtid_data,
-					      connection);
+					      &ctx);
   if (GNUNET_SYSERR == ret)
   {
     GNUNET_break (0);
diff --git a/src/mint/taler-mint-httpd_db.h b/src/mint/taler-mint-httpd_db.h
index d9adba2d9..0ee3d0509 100644
--- a/src/mint/taler-mint-httpd_db.h
+++ b/src/mint/taler-mint-httpd_db.h
@@ -193,6 +193,19 @@ TMH_DB_execute_admin_add_incoming (struct MHD_Connection *connection,
 
 
 /**
+ * Execute a "/wire/deposits".  Returns the transaction information
+ * associated with the given wire transfer identifier.
+ *
+ * @param connection the MHD connection to handle
+ * @param wtid wire transfer identifier to resolve
+ * @return MHD result code
+ */
+int
+TMH_DB_execute_wire_deposits (struct MHD_Connection *connection,
+                              const struct TALER_WireTransferIdentifierP *wtid);
+
+
+/**
  * Execute a "/deposit/wtid".  Returns the transfer information
  * associated with the given deposit.
  *
@@ -212,5 +225,6 @@ TMH_DB_execute_deposit_wtid (struct MHD_Connection *connection,
 			     const struct TALER_MerchantPublicKeyP *merchant_pub,
 			     uint64_t transaction_id);
 
+
 #endif
 /* TALER_MINT_HTTPD_DB_H */
diff --git a/src/mint/taler-mint-httpd_responses.c b/src/mint/taler-mint-httpd_responses.c
index f3498b469..9a55d5aab 100644
--- a/src/mint/taler-mint-httpd_responses.c
+++ b/src/mint/taler-mint-httpd_responses.c
@@ -1056,15 +1056,15 @@ TMH_RESPONSE_reply_refresh_link_success (struct MHD_Connection *connection,
  * 404 reply.
  *
  * @param connection connection to the client
- * @param 
  * @return MHD result code
  */
 int
-TMH_RESPONSE_reply_deposit_unknown (struct MHD_Connection *connection,
-				    ...)
+TMH_RESPONSE_reply_deposit_unknown (struct MHD_Connection *connection)
 {
-  GNUNET_break (0); // FIXME: not implemented
-  return MHD_NO;
+  return TMH_RESPONSE_reply_json_pack (connection,
+                                       MHD_HTTP_NOT_FOUND,
+                                       "{s:s}",
+                                       "error", "Deposit unknown");
 }
 
 
@@ -1073,15 +1073,17 @@ TMH_RESPONSE_reply_deposit_unknown (struct MHD_Connection *connection,
  * we did not execute the deposit yet. Generate a 202 reply.
  *
  * @param connection connection to the client
- * @param 
+ * @param planned_exec_time planned execution time
  * @return MHD result code
  */
 int
 TMH_RESPONSE_reply_deposit_pending (struct MHD_Connection *connection,
-				    ...)
+				    struct GNUNET_TIME_Absolute planned_exec_time)
 {
-  GNUNET_break (0); // FIXME: not implemented
-  return MHD_NO;
+  return TMH_RESPONSE_reply_json_pack (connection,
+                                       MHD_HTTP_FOUND,
+                                       "{s:o}",
+                                       "execution_time", TALER_json_from_abs (planned_exec_time));
 }
 
 
@@ -1090,15 +1092,58 @@ TMH_RESPONSE_reply_deposit_pending (struct MHD_Connection *connection,
  * them. Generates the 200 reply.
  *
  * @param connection connection to the client
- * @param 
+ * @param wtid wire transfer identifier (as 0-terminated string)
+ * @param exec_time execution time of the wire transfer
  * @return MHD result code
  */
 int
 TMH_RESPONSE_reply_deposit_wtid (struct MHD_Connection *connection,
-				 ...)
+				 const char *wtid,
+                                 struct GNUNET_TIME_Absolute exec_time)
+{
+  struct TALER_ConfirmWirePS cw;
+  struct TALER_MintPublicKeyP pub;
+  struct TALER_MintSignatureP sig;
+
+  cw.purpose.purpose = htonl (TALER_SIGNATURE_MINT_CONFIRM_WIRE);
+  cw.purpose.size = htonl (sizeof (struct TALER_ConfirmWirePS));
+  // FIXME: fill in rest of 'cw'!
+  TMH_KS_sign (&cw.purpose,
+               &pub,
+               &sig);
+  return TMH_RESPONSE_reply_json_pack (connection,
+                                       MHD_HTTP_FOUND,
+                                       "{s:s, s:o, s:o, s:o}",
+                                       "wtid", wtid,
+                                       "execution_time", TALER_json_from_abs (exec_time),
+                                       "mint_sig", TALER_json_from_data (&sig,
+                                                                         sizeof (sig)),
+                                       "mint_pub", TALER_json_from_data (&pub,
+                                                                         sizeof (pub)));
+}
+
+
+/**
+ * A merchant asked for transaction details about a wire transfer.
+ * Provide them. Generates the 200 reply.
+ *
+ * @param connection connection to the client
+ * @param total total amount that was transferred
+ * @param merchant_pub public key of the merchant
+ * @param h_wire destination account
+ * @param deposits details about the combined deposits
+ * @return MHD result code
+ */
+int
+TMH_RESPONSE_reply_wire_deposit_details (struct MHD_Connection *connection,
+                                         const struct TALER_Amount *total,
+                                         const struct TALER_MerchantPublicKeyP *merchant_pub,
+                                         const struct GNUNET_HashCode *h_wire,
+                                         json_t *deposits)
 {
   GNUNET_break (0); // FIXME: not implemented
   return MHD_NO;
 }
 
+
 /* end of taler-mint-httpd_responses.c */
diff --git a/src/mint/taler-mint-httpd_responses.h b/src/mint/taler-mint-httpd_responses.h
index 5d1523b4b..6debbc935 100644
--- a/src/mint/taler-mint-httpd_responses.h
+++ b/src/mint/taler-mint-httpd_responses.h
@@ -253,12 +253,10 @@ TMH_RESPONSE_reply_deposit_insufficient_funds (struct MHD_Connection *connection
  * 404 reply.
  *
  * @param connection connection to the client
- * @param 
  * @return MHD result code
  */
 int
-TMH_RESPONSE_reply_deposit_unknown (struct MHD_Connection *connection,
-				    ...);
+TMH_RESPONSE_reply_deposit_unknown (struct MHD_Connection *connection);
 
 
 /**
@@ -266,12 +264,12 @@ TMH_RESPONSE_reply_deposit_unknown (struct MHD_Connection *connection,
  * we did not execute the deposit yet. Generate a 202 reply.
  *
  * @param connection connection to the client
- * @param 
+ * @param planned_exec_time planned execution time
  * @return MHD result code
  */
 int
 TMH_RESPONSE_reply_deposit_pending (struct MHD_Connection *connection,
-				    ...);
+				    struct GNUNET_TIME_Absolute planned_exec_time);
 
 
 /**
@@ -279,12 +277,33 @@ TMH_RESPONSE_reply_deposit_pending (struct MHD_Connection *connection,
  * them. Generates the 200 reply.
  *
  * @param connection connection to the client
- * @param 
+ * @param wtid wire transfer identifier (as 0-terminated string)
+ * @param exec_time execution time of the wire transfer
  * @return MHD result code
  */
 int
 TMH_RESPONSE_reply_deposit_wtid (struct MHD_Connection *connection,
-				 ...);
+				 const char *wtid,
+                                 struct GNUNET_TIME_Absolute exec_time);
+
+
+/**
+ * A merchant asked for transaction details about a wire transfer.
+ * Provide them. Generates the 200 reply.
+ *
+ * @param connection connection to the client
+ * @param total total amount that was transferred
+ * @param merchant_pub public key of the merchant
+ * @param h_wire destination account
+ * @param deposits details about the combined deposits
+ * @return MHD result code
+ */
+int
+TMH_RESPONSE_reply_wire_deposit_details (struct MHD_Connection *connection,
+                                         const struct TALER_Amount *total,
+                                         const struct TALER_MerchantPublicKeyP *merchant_pub,
+                                         const struct GNUNET_HashCode *h_wire,
+                                         json_t *deposits);
 
 
 /**
diff --git a/src/mint/taler-mint-httpd_tracking.c b/src/mint/taler-mint-httpd_tracking.c
index 59d029429..e61b4bae1 100644
--- a/src/mint/taler-mint-httpd_tracking.c
+++ b/src/mint/taler-mint-httpd_tracking.c
@@ -1,6 +1,6 @@
 /*
   This file is part of TALER
-  Copyright (C) 2014, 2015 GNUnet e.V.
+  Copyright (C) 2014, 2015, 2016 GNUnet e.V.
 
   TALER is free software; you can redistribute it and/or modify it under the
   terms of the GNU Affero General Public License as published by the Free Software
@@ -46,8 +46,24 @@ TMH_TRACKING_handler_wire_deposits (struct TMH_RequestHandler *rh,
                                     const char *upload_data,
                                     size_t *upload_data_size)
 {
-  GNUNET_break (0); // not implemented
-  return MHD_NO;
+  struct TALER_WireTransferIdentifierP wtid;
+  int res;
+
+  res = TMH_PARSE_mhd_request_arg_data (connection,
+                                        "wtid",
+                                        &wtid,
+                                        sizeof (struct TALER_WireTransferIdentifierP));
+  if (GNUNET_SYSERR == res)
+    return MHD_NO; /* internal error */
+  if (GNUNET_NO == res)
+    return MHD_YES; /* parse error */
+  if (wtid.crc8 !=
+      GNUNET_CRYPTO_crc8_n (&wtid.raw,
+                            sizeof (wtid.raw)))
+    return TMH_RESPONSE_reply_arg_invalid (connection,
+                                           "wtid");
+  return TMH_DB_execute_wire_deposits (connection,
+                                       &wtid);
 }
 
 
@@ -57,7 +73,7 @@ TMH_TRACKING_handler_wire_deposits (struct TMH_RequestHandler *rh,
  *
  * @param connection the MHD connection to handle
  * @param tps signed request to execute
- * @param merchant_pub public key from the merchant 
+ * @param merchant_pub public key from the merchant
  * @param merchant_sig signature from the merchant (to be checked)
  * @param transaction_id transaction ID (in host byte order)
  * @return MHD result code
diff --git a/src/mintdb/plugin_mintdb_postgres.c b/src/mintdb/plugin_mintdb_postgres.c
index 0f32cfb8e..2ebc8f0ff 100644
--- a/src/mintdb/plugin_mintdb_postgres.c
+++ b/src/mintdb/plugin_mintdb_postgres.c
@@ -3365,10 +3365,33 @@ postgres_get_coin_transactions (void *cls,
 
 
 /**
+ * Lookup the list of Taler transactions that was aggregated
+ * into a wire transfer by the respective @a raw_wtid.
+ *
+ * @param cls closure
+ * @param raw_wtid the raw wire transfer identifier we used
+ * @param raw_len number of bytes in @a raw_wtid (right now always 32)
+ * @param cb function to call on each transaction found
+ * @param cb_cls closure for @a cb
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on database errors
+ */
+static int
+postgres_lookup_wire_transactions (void *cls,
+                                   const void *raw_wtid,
+                                   size_t raw_len,
+                                   TALER_MINTDB_TransactionDataCallback cb,
+                                   void *cb_cls)
+{
+  GNUNET_break (0); // not implemented!
+  return GNUNET_SYSERR;
+}
+
+
+/**
  * Try to find the wire transfer details for a deposit operation.
  * If we did not execute the deposit yet, return when it is supposed
  * to be executed.
- * 
+ *
  * @param cls closure
  * @param h_contract hash of the contract
  * @param h_wire hash of merchant wire details
@@ -3465,6 +3488,7 @@ libtaler_plugin_mintdb_postgres_init (void *cls)
   plugin->get_transfer = &postgres_get_transfer;
   plugin->get_coin_transactions = &postgres_get_coin_transactions;
   plugin->free_coin_transaction_list = &common_free_coin_transaction_list;
+  plugin->lookup_wire_transactions = &postgres_lookup_wire_transactions;
   plugin->wire_lookup_deposit_wtid = &postgres_wire_lookup_deposit_wtid;
   return plugin;
 }