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diff --git a/src/exchangedb/pg_get_reserve_by_h_blind.h b/src/exchangedb/pg_get_reserve_by_h_blind.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 exchangedb/pg_get_reserve_by_h_blind.h
+ * @brief implementation of the get_reserve_by_h_blind function for Postgres
+ * @author Christian Grothoff
+ */
+#ifndef PG_GET_RESERVE_BY_H_BLIND_H
+#define PG_GET_RESERVE_BY_H_BLIND_H
+
+#include "taler_util.h"
+#include "taler_json_lib.h"
+#include "taler_exchangedb_plugin.h"
+/**
+ * Obtain information about which reserve a coin was generated
+ * from given the hash of the blinded coin.
+ *
+ * @param cls closure
+ * @param bch hash that uniquely identifies the withdraw request
+ * @param[out] reserve_pub set to information about the reserve (on success only)
+ * @param[out] reserve_out_serial_id set to row of the @a h_blind_ev in reserves_out
+ * @return transaction status code
+ */
+enum GNUNET_DB_QueryStatus
+TEH_PG_get_reserve_by_h_blind (
+ void *cls,
+ const struct TALER_BlindedCoinHashP *bch,
+ struct TALER_ReservePublicKeyP *reserve_pub,
+ uint64_t *reserve_out_serial_id);
+
+#endif