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diff --git a/src/backenddb/pg_lookup_instance_auth.h b/src/backenddb/pg_lookup_instance_auth.h
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+++ b/src/backenddb/pg_lookup_instance_auth.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_lookup_instance_auth.h
+ * @brief implementation of the lookup_instance_auth function for Postgres
+ * @author Iván Ávalos
+ */
+#ifndef PG_LOOKUP_INSTANCE_AUTH_H
+#define PG_LOOKUP_INSTANCE_AUTH_H
+
+#include <taler/taler_util.h>
+#include <taler/taler_json_lib.h>
+#include "taler_merchantdb_plugin.h"
+
+/**
+ * Lookup authentication data of an instance.
+ *
+ * @param cls closure
+ * @param instance_id instance to query
+ * @param[out] ias where to store the auth data
+ */
+enum GNUNET_DB_QueryStatus
+TMH_PG_lookup_instance_auth (void *cls,
+                             const char *instance_id,
+                             struct TALER_MERCHANTDB_InstanceAuthSettings *ias);
+
+#endif