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diff --git a/src/backenddb/pg_lookup_transfers.h b/src/backenddb/pg_lookup_transfers.h
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+++ b/src/backenddb/pg_lookup_transfers.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_transfers.h
+ * @brief implementation of the lookup_transfers function for Postgres
+ * @author Christian Grothoff
+ */
+#ifndef PG_LOOKUP_TRANSFERS_H
+#define PG_LOOKUP_TRANSFERS_H
+
+#include <taler/taler_util.h>
+#include <taler/taler_json_lib.h>
+#include "taler_merchantdb_plugin.h"
+
+/**
+ * Lookup transfers. Note that filtering by @a verified status is done
+ * outside of SQL, as we already have 8 prepared statements and adding
+ * a filter on verified would further double the number of statements for
+ * a likely rather ineffective filter. So we apply that filter in
+ * #lookup_transfers_cb().
+ *
+ * @param cls closure
+ * @param instance_id instance to lookup payments for
+ * @param payto_uri account that we are interested in transfers to
+ * @param before timestamp for the earliest transfer we care about
+ * @param after timestamp for the last transfer we care about
+ * @param limit number of entries to return, negative for descending in execution time,
+ *                positive for ascending in execution time
+ * @param offset transfer_serial number of the transfer we want to offset from
+ * @param verified filter transfers by verification status
+ * @param cb function to call with detailed transfer data
+ * @param cb_cls closure for @a cb
+ * @return transaction status
+ */
+enum GNUNET_DB_QueryStatus
+TMH_PG_lookup_transfers (void *cls,
+                         const char *instance_id,
+                         const char *payto_uri,
+                         struct GNUNET_TIME_Timestamp before,
+                         struct GNUNET_TIME_Timestamp after,
+                         int64_t limit,
+                         uint64_t offset,
+                         enum TALER_EXCHANGE_YesNoAll verified,
+                         TALER_MERCHANTDB_TransferCallback cb,
+                         void *cb_cls);
+
+#endif