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diff --git a/src/backend/taler-merchant-httpd_helper.h b/src/backend/taler-merchant-httpd_helper.h
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+/*
+  This file is part of TALER
+  Copyright (C) 2021 Taler Systems SA
+
+  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
+  Foundation; either version 3, or (at your option) any later version.
+
+  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 Affero General Public License for more details.
+
+  You should have received a copy of the GNU Affero General Public License along with
+  TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+*/
+
+/**
+ * @file taler-merchant-httpd_helper.h
+ * @brief helpers for shared logic
+ * @author Florian Dold
+ * @author Benedikt Mueller
+ * @author Christian Grothoff
+ */
+#ifndef TALER_EXCHANGE_HTTPD_HELPER_H
+#define TALER_EXCHANGE_HTTPD_HELPER_H
+
+
+#include "taler-merchant-httpd.h"
+
+/**
+ * check @a payto_uris for well-formedness
+ *
+ * @param payto_uris JSON array of payto URIs (presumably)
+ * @return true if they are all valid URIs (and this is an array of strings)
+ */
+bool
+TMH_payto_uri_array_valid (const json_t *payto_uris);
+
+
+/**
+ * Setup new wire method for the given @ payto_uri.
+ *
+ * @param payto_uri already validated payto URI
+ * @return new wire method object, never fails
+ */
+struct TMH_WireMethod *
+TMH_setup_wire_account (const char *payto_uri);
+
+
+#endif