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diff --git a/src/backenddb/pg_lookup_reward_details.h b/src/backenddb/pg_lookup_reward_details.h
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+++ b/src/backenddb/pg_lookup_reward_details.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_reward_details.h
+ * @brief implementation of the lookup_reward_details function for Postgres
+ * @author Iván Ávalos
+ */
+#ifndef PG_LOOKUP_REWARD_DETAILS_H
+#define PG_LOOKUP_REWARD_DETAILS_H
+
+#include <taler/taler_util.h>
+#include <taler/taler_json_lib.h>
+#include "taler_merchantdb_plugin.h"
+
+/**
+ * Lookup reward details for reward @a reward_id.
+ *
+ * @param cls closure, typically a connection to the db
+ * @param instance_id which instance should we lookup reward details for
+ * @param reward_id which reward should we lookup details on
+ * @param fpu should we fetch details about individual pickups
+ * @param[out] total_authorized amount how high is the reward (with fees)
+ * @param[out] total_picked_up how much of the reward was so far picked up (with fees)
+ * @param[out] justification why was the reward approved
+ * @param[out] expiration set to when the reward expires
+ * @param[out] reserve_pub set to which reserve is debited
+ * @param[out] pickups_length set to the length of @e pickups
+ * @param[out] pickups if @a fpu is true, set to details about the pickup operations
+ * @return transaction status,
+ */
+enum GNUNET_DB_QueryStatus
+TMH_PG_lookup_reward_details (void *cls,
+                              const char *instance_id,
+                              const struct TALER_RewardIdentifierP *reward_id,
+                              bool fpu,
+                              struct TALER_Amount *total_authorized,
+                              struct TALER_Amount *total_picked_up,
+                              char **justification,
+                              struct GNUNET_TIME_Timestamp *expiration,
+                              struct TALER_ReservePublicKeyP *reserve_pub,
+                              unsigned int *pickups_length,
+                              struct TALER_MERCHANTDB_PickupDetails **pickups);
+
+#endif