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diff --git a/src/backenddb/pg_update_template.h b/src/backenddb/pg_update_template.h
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+/*
+   This file is part of TALER
+   Copyright (C) 2022 Taler Systems SA
+
+   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.
+
+   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
+   TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+/**
+ * @file backenddb/pg_update_template.h
+ * @brief implementation of the update_template function for Postgres
+ * @author Christian Grothoff
+ */
+#ifndef PG_UPDATE_TEMPLATE_H
+#define PG_UPDATE_TEMPLATE_H
+
+#include <taler/taler_util.h>
+#include <taler/taler_json_lib.h>
+#include "taler_merchantdb_plugin.h"
+
+
+/**
+ * Update details about a particular template.
+ *
+ * @param cls closure
+ * @param instance_id instance to update template for
+ * @param template_id template to update
+ * @param td update to the template details on success, can be NULL
+ *             (in that case we only want to check if the template exists)
+ * @return database result code, #GNUNET_DB_STATUS_SUCCESS_NO_RESULTS if the template
+ *         does not yet exist.
+ */
+enum GNUNET_DB_QueryStatus
+TMH_PG_update_template (void *cls,
+                        const char *instance_id,
+                        const char *template_id,
+                        const struct TALER_MERCHANTDB_TemplateDetails *td);
+
+#endif