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diff --git a/src/backenddb/pg_increase_refund.h b/src/backenddb/pg_increase_refund.h
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+++ b/src/backenddb/pg_increase_refund.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_increase_refund.h
+ * @brief implementation of the increase_refund function for Postgres
+ * @author Christian Grothoff
+ */
+#ifndef PG_INCREASE_REFUND_H
+#define PG_INCREASE_REFUND_H
+
+#include <taler/taler_util.h>
+#include <taler/taler_json_lib.h>
+#include "taler_merchantdb_plugin.h"
+
+
+/**
+ * Function called when some backoffice staff decides to award or
+ * increase the refund on an existing contract.  This function
+ * MUST be called from within a transaction scope setup by the
+ * caller as it executes mulrewardle SQL statements.
+ *
+ * @param cls closure
+ * @param instance_id instance identifier
+ * @param order_id the order to increase the refund for
+ * @param refund maximum refund to return to the customer for this contract
+ * @param reason 0-terminated UTF-8 string giving the reason why the customer
+ *               got a refund (free form, business-specific)
+ * @return transaction status
+ *        #GNUNET_DB_STATUS_SUCCESS_NO_RESULTS if @a refund is ABOVE the amount we
+ *        were originally paid and thus the transaction failed;
+ *        #GNUNET_DB_STATUS_SUCCESS_ONE_RESULT if the request is valid,
+ *        regardless of whether it actually increased the refund beyond
+ *        what was already refunded (idempotency!)
+ */
+enum TALER_MERCHANTDB_RefundStatus
+TMH_PG_increase_refund (void *cls,
+                        const char *instance_id,
+                        const char *order_id,
+                        const struct TALER_Amount *refund,
+                        const char *reason);
+
+
+#endif