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diff --git a/src/backenddb/pg_authorize_reward.h b/src/backenddb/pg_authorize_reward.h
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+++ b/src/backenddb/pg_authorize_reward.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_authorize_reward.h
+ * @brief implementation of the authorize_reward function for Postgres
+ * @author Christian Grothoff
+ */
+#ifndef PG_AUTHORIZE_REWARD_H
+#define PG_AUTHORIZE_REWARD_H
+
+#include <taler/taler_util.h>
+#include <taler/taler_json_lib.h>
+#include "taler_merchantdb_plugin.h"
+
+
+/**
+ * Authorize a reward over @a amount from reserve @a reserve_pub.  Remember
+ * the authorization under @a reward_id for later, together with the
+ * @a justification.
+ *
+ * @param cls closure, typically a connection to the db
+ * @param instance_id which instance should generate the reward
+ * @param reserve_pub which reserve is debited, NULL to pick one in the DB
+ * @param amount how high is the reward (with fees)
+ * @param justification why was the reward approved
+ * @param next_url where to send the URL post reward pickup
+ * @param[out] reward_id set to the unique ID for the reward
+ * @param[out] expiration set to when the reward expires
+ * @return transaction status,
+ *      #TALER_EC_MERCHANT_PRIVATE_POST_REWARD_AUTHORIZE_RESERVE_EXPIRED if the reserve is known but has expired
+ *      #TALER_EC_MERCHANT_PRIVATE_POST_REWARD_AUTHORIZE_RESERVE_NOT_FOUND if the reserve is not known
+ *      #TALER_EC_MERCHANT_PRIVATE_POST_REWARD_AUTHORIZE_INSUFFICIENT_FUNDS if the reserve has insufficient funds left
+ *      #TALER_EC_GENERIC_DB_START_FAILED on hard DB errors
+ *      #TALER_EC_GENERIC_DB_FETCH_FAILED on hard DB errors
+ *      #TALER_EC_GENERIC_DB_STORE_FAILED on hard DB errors
+ *      #TALER_EC_GENERIC_DB_INVARIANT_FAILURE on hard DB errors
+ *      #TALER_EC_GENERIC_DB_SOFT_FAILURE soft DB errors (client should retry)
+ *      #TALER_EC_NONE upon success
+ */
+enum TALER_ErrorCode
+TMH_PG_authorize_reward (void *cls,
+                         const char *instance_id,
+                         const struct TALER_ReservePublicKeyP *reserve_pub,
+                         const struct TALER_Amount *amount,
+                         const char *justification,
+                         const char *next_url,
+                         struct TALER_RewardIdentifierP *reward_id,
+                         struct GNUNET_TIME_Timestamp *expiration);
+
+
+#endif