diff --git a/src/include/taler_exchangedb_plugin.h b/src/include/taler_exchangedb_plugin.h
index 2b2d43074..6e5947377 100644
--- a/src/include/taler_exchangedb_plugin.h
+++ b/src/include/taler_exchangedb_plugin.h
@@ -716,13 +716,17 @@ typedef int
  * Callback used to process data of a merchant under KYC monitoring.
  *
  * @param cls closure
- * @param payto_url payto URL of this particular merchant (bank account)
- * @param general_id general identificator valid at the KYC-caring institution
- * @param kyc_checked status of KYC check: if GNUNET_OK, the merchant was
- *        checked at least once, never otherwise.
- * @param merchant_serial_id serial ID identifying this merchant (bank
- *        account) into the database system; it helps making more efficient
- *        queries instead of the payto URL.
+ * @param payto_url payto URL of this particular
+ *        merchant (bank account)
+ * @param general_id general identificator valid
+ *        at the KYC-caring institution
+ * @param kyc_checked status of KYC check:
+ *        if GNUNET_OK, the merchant was checked at least once,
+ *        never otherwise.
+ * @param merchant_serial_id serial ID identifying
+ *        this merchant (bank account) into the database system;
+ *        it helps making more efficient queries than the payto
+ *        URL.
  */
 typedef void
 (*TALER_EXCHANGEDB_KycStatusCallback)(void *cls,
diff --git a/src/include/taler_wire_plugin.h b/src/include/taler_wire_plugin.h
index 2758d2d2e..ddbb725a7 100644
--- a/src/include/taler_wire_plugin.h
+++ b/src/include/taler_wire_plugin.h
@@ -40,6 +40,17 @@ typedef void
                                           size_t buf_size);
 
 
+/**
+ * Callback to process a merchant registration outcome.
+ *
+ * @param cls closure
+ * @param status GNUNET_OK if the registration succeeded,
+ *        GNUNET_NO otherwise.
+ */
+typedef void
+(*TALER_WIRE_MerchantRegisterCallback) (void *cls,
+                                        unsigned int status);
+
 /**
  * Details about a valid wire transfer to the exchange.
  * It is the plugin's responsibility to filter and undo
@@ -356,6 +367,34 @@ struct TALER_WIRE_Plugin
                             struct TALER_WIRE_RejectHandle *rh);
 
 
+  /**
+   * Ask the plugin which data is needed to register the merchant
+   * into the banking institution.
+   *
+   * @param enc[out] where to store the JSON formatted list of
+   *        needed values.  The merchant will use this list to
+   *        show a HTML form to the business in order to collect that data.
+   *        This value will have to be freed by the caller.
+   * @return GNUNET_OK upon successful `enc' allocation and definition,
+   *         GNUNET_NO if _no_ data is needed at all, GNUNET_SYSERR
+   *         for all the other cases.
+   */
+  int
+  (*merchant_data)(void);
+
+  /**
+   * Send data to the banking institution in order to get the
+   * merchant registered.
+   *
+   * @param cls closure
+   * @param body subset of information to be sent to the bank.
+   *        The plugin implementation is free to modify this value.
+   * @param mrcb Callback to process the outcome.
+   */
+  struct TALER_WIRE_MerchantRegisterHandle *
+  (*merchant_register)(void *cls,
+                       const char *body,
+                       TALER_WIRE_MerchantRegisterCallback mrcb);
 };
 
 
diff --git a/src/wire-plugins/plugin_wire_taler-bank.c b/src/wire-plugins/plugin_wire_taler-bank.c
index c2282bc4b..2c967a1b2 100644
--- a/src/wire-plugins/plugin_wire_taler-bank.c
+++ b/src/wire-plugins/plugin_wire_taler-bank.c
@@ -712,6 +712,7 @@ taler_bank_execute_wire_transfer (void *cls,
   origin_account_url = &buf[sizeof (struct BufFormatP)];
   left = buf_size - sizeof (struct BufFormatP);
   slen = strlen (origin_account_url) + 1;
+  /* make sure there's enough space to accomodate what's been taken now */
   GNUNET_assert (left >= slen);
   left -= slen;
   if (0 == left)