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diff --git a/src/backend/taler-merchant-httpd_reserves_get.h b/src/backend/taler-merchant-httpd_reserves_get.h
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+++ b/src/backend/taler-merchant-httpd_reserves_get.h
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+/*
+  This file is part of TALER
+  (C) 2018--2019 Taler Systems SA
+
+  TALER is free software; you can redistribute it and/or modify it under the
+  terms of the GNU Affero 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 backend/taler-merchant-httpd_tip-reserve-helper.h
+ * @brief helper functions to check the status of a tipping reserve
+ * @author Christian Grothoff
+ */
+#ifndef TALER_MERCHANT_HTTPD_TIP_RESERVE_HELPER_H
+#define TALER_MERCHANT_HTTPD_TIP_RESERVE_HELPER_H
+#include <jansson.h>
+#include <taler/taler_util.h>
+#include <taler/taler_json_lib.h>
+#include "taler-merchant-httpd.h"
+#include "taler-merchant-httpd_mhd.h"
+#include "taler-merchant-httpd_exchanges.h"
+#include "taler-merchant-httpd_tip-reserve-helper.h"
+
+
+/**
+ * Context with input, output and internal state for
+ * #TMH_check_tip_reserve() and #TMH_check_tip_reserve_cleanup().
+ */
+struct TMH_CheckTipReserve
+{
+  /**
+   * Input: MHD connection we should resume when finished
+   */
+  struct MHD_Connection *connection;
+
+  /**
+   * Input: private key of the reserve.
+   */
+  struct TALER_ReservePrivateKeyP reserve_priv;
+
+  /**
+   * Output: Set to delay after which the reserve will expire if idle.
+   */
+  struct GNUNET_TIME_Relative idle_reserve_expiration_time;
+
+  /**
+   * Internal: exchange find operation.
+   */
+  struct TMH_EXCHANGES_FindOperation *fo;
+
+  /**
+   * Internal: reserve status operation.
+   */
+  struct TALER_EXCHANGE_ReservesGetHandle *rsh;
+
+  /**
+   * Internal: DLL for resumption on shutdown.
+   */
+  struct TMH_CheckTipReserve *next;
+
+  /**
+   * Internal: DLL for resumption on shutdown.
+   */
+  struct TMH_CheckTipReserve *prev;
+
+  /**
+   * Output: response object to return (on error only)
+   */
+  struct MHD_Response *response;
+
+  /**
+   * Output: Total amount deposited into the reserve.
+   */
+  struct TALER_Amount amount_deposited;
+
+  /**
+   * Output: total tip amount requested.
+   */
+  struct TALER_Amount amount_withdrawn;
+
+  /**
+   * Input: total amount authorized.
+   */
+  struct TALER_Amount amount_authorized;
+
+  /**
+   * Output: set to the time when the reserve will expire
+   */
+  struct GNUNET_TIME_Absolute reserve_expiration;
+
+  /**
+   * Output: HTTP status code to return (on error only)
+   */
+  unsigned int response_code;
+
+  /**
+   * Input: Set to #GNUNET_NO if no tips were authorized yet.
+   * Used to know that @e amount_authorized is not yet initialized
+   * and in that case the helper will set it to zero (once we know
+   * the currency).
+   */
+  int none_authorized;
+
+  /**
+   * Internal: Is the @e connection currently suspended?
+   * #GNUNET_NO if the @e connection was not suspended,
+   * #GNUNET_YES if the @e connection was suspended,
+   * #GNUNET_SYSERR if @e connection was resumed to as
+   * part of #MH_force_pc_resume during shutdown.
+   */
+  int suspended;
+
+};
+
+
+/**
+ * Check the status of the given reserve at the given exchange.
+ * Suspends the MHD connection while this is happening and resumes
+ * processing once we know the reserve status (or once an error
+ * code has been determined).
+ *
+ * @param[in,out] ctr context for checking the reserve status
+ * @param tip_exchange the URL of the exchange to query
+ */
+void
+TMH_check_tip_reserve (struct TMH_CheckTipReserve *ctr,
+                       const char *tip_exchange);
+
+
+/**
+ * Clean up any state that might be left in @a ctr.
+ *
+ * @param[in] context to clean up
+ */
+void
+TMH_check_tip_reserve_cleanup (struct TMH_CheckTipReserve *ctr);
+
+/**
+ * Force all tip reserve helper contexts to be resumed as we are about to shut
+ * down MHD.
+ */
+void
+MH_force_trh_resume (void);
+
+
+#endif