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diff --git a/src/backenddb/pg_lookup_order_by_fulfillment.c b/src/backenddb/pg_lookup_order_by_fulfillment.c
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+++ b/src/backenddb/pg_lookup_order_by_fulfillment.c
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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_order_by_fulfillment.c
+ * @brief Implementation of the lookup_order_by_fulfillment function for Postgres
+ * @author Iván Ávalos
+ */
+#include "platform.h"
+#include <taler/taler_error_codes.h>
+#include <taler/taler_dbevents.h>
+#include <taler/taler_pq_lib.h>
+#include "pg_lookup_order_by_fulfillment.h"
+#include "pg_helper.h"
+
+
+enum GNUNET_DB_QueryStatus
+TMH_PG_lookup_order_by_fulfillment (
+  void *cls,
+  const char *instance_id,
+  const char *fulfillment_url,
+  const char *session_id,
+  bool allow_refunded_for_repurchase,
+  char **order_id)
+{
+  struct PostgresClosure *pg = cls;
+  struct GNUNET_PQ_QueryParam params[] = {
+    GNUNET_PQ_query_param_string (instance_id),
+    GNUNET_PQ_query_param_string (fulfillment_url),
+    GNUNET_PQ_query_param_string (session_id),
+    GNUNET_PQ_query_param_bool (allow_refunded_for_repurchase),
+    GNUNET_PQ_query_param_end
+  };
+  struct GNUNET_PQ_ResultSpec rs[] = {
+    GNUNET_PQ_result_spec_string ("order_id",
+                                  order_id),
+    GNUNET_PQ_result_spec_end
+  };
+
+  check_connection (pg);
+  PREPARE (pg,
+           "lookup_order_by_fulfillment",
+           "SELECT"
+           "  mct.order_id"
+           " FROM merchant_contract_terms mct"
+           " LEFT JOIN merchant_refunds mref"
+           "   USING (order_serial)"
+           " WHERE fulfillment_url=$2"
+           "   AND session_id=$3"
+           "   AND merchant_serial="
+           "        (SELECT merchant_serial"
+           "           FROM merchant_instances"
+           "          WHERE merchant_id=$1)"
+           "   AND ((CAST($4 AS BOOL)) OR"
+           "        mref.refund_serial IS NULL)"
+           /* Theoretically, multiple paid orders
+              for the same fulfillment URL could
+              exist for this session_id -- if a
+              wallet was broken and did multiple
+              payments without repurchase detection.
+              So we need to limit to 1 when returning! */
+           " ORDER BY order_id DESC"
+           " LIMIT 1;");
+  return GNUNET_PQ_eval_prepared_singleton_select (pg->conn,
+                                                   "lookup_order_by_fulfillment",
+                                                   params,
+                                                   rs);
+}