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diff --git a/src/exchangedb/plugin_exchangedb_postgres.h b/src/exchangedb/plugin_exchangedb_postgres.h
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+++ b/src/exchangedb/plugin_exchangedb_postgres.h
@@ -0,0 +1,43 @@
+/*
+   This file is part of TALER
+   Copyright (C) 2014--2023 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 plugin_exchangedb_postgres.h
+ * @brief Low-level (statement-level) Postgres database access for the exchange
+ * @author Florian Dold
+ * @author Christian Grothoff
+ * @author Sree Harsha Totakura
+ * @author Marcello Stanisci
+ * @author Özgür Kesim
+ */
+#ifndef PLUGIN_EXCHANGEDB_POSTGRES_H
+#define PLUGIN_EXCHANGEDB_POSTGRES_H
+#include "platform.h"
+#include "taler_error_codes.h"
+#include "taler_dbevents.h"
+#include "taler_pq_lib.h"
+
+
+/**
+ * Connect to the database if the connection does not exist yet.
+ *
+ * @param pg the plugin-specific state
+ * @return #GNUNET_OK on success
+ */
+enum GNUNET_GenericReturnValue
+TEH_PG_internal_setup (struct PostgresClosure *pg);
+
+#endif