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diff --git a/src/backenddb/pg_lookup_transfer.h b/src/backenddb/pg_lookup_transfer.h
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+++ b/src/backenddb/pg_lookup_transfer.h
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+/*
+   This file is part of TALER
+   Copyright (C) 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 backenddb/pg_lookup_transfer.h
+ * @brief implementation of the lookup_transfer function for Postgres
+ * @author Iván Ávalos
+ */
+#ifndef PG_LOOKUP_TRANSFER_H
+#define PG_LOOKUP_TRANSFER_H
+
+#include <taler/taler_util.h>
+#include <taler/taler_json_lib.h>
+#include "taler_merchantdb_plugin.h"
+
+/**
+ * Lookup transfer status.
+ *
+ * @param cls closure
+ * @param instance_id at which instance should we resolve the transfer
+ * @param exchange_url the exchange that made the transfer
+ * @param wtid wire transfer subject
+ * @param[out] total_amount amount that was debited from our
+ *             aggregate balance at the exchange (in total, sum of
+ *             the wire transfer amount and the @a wire_fee)
+ * @param[out] wire_fee the wire fee the exchange charged (only set if @a have_exchange_sig is true)
+ * @param[out] exchange_amount the amount the exchange claims was transferred (only set if @a have_exchange_sig is true)
+ * @param[out] execution_time when the transfer was executed by the exchange (only set if @a have_exchange_sig is true)
+ * @param[out] have_exchange_sig do we have a response from the exchange about this transfer
+ * @param[out] verified did we confirm the transfer was OK
+ * @return transaction status
+ */
+enum GNUNET_DB_QueryStatus
+TMH_PG_lookup_transfer (void *cls,
+                        const char *instance_id,
+                        const char *exchange_url,
+                        const struct TALER_WireTransferIdentifierRawP *wtid,
+                        struct TALER_Amount *total_amount,
+                        struct TALER_Amount *wire_fee,
+                        struct TALER_Amount *exchange_amount,
+                        struct GNUNET_TIME_Timestamp *execution_time,
+                        bool *have_exchange_sig,
+                        bool *verified);
+
+#endif