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diff --git a/src/backend/taler-merchant-httpd_responses.h b/src/backend/taler-merchant-httpd_responses.h
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+/*
+  This file is part of TALER
+  Copyright (C) 2014, 2015 GNUnet e.V.
+
+  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 Affero General Public License for more details.
+
+  You should have received a copy of the GNU Affero General Public License along with
+  TALER; see the file COPYING.  If not, If not, see <http://www.gnu.org/licenses/>
+*/
+
+/**
+ * @file taler-merchant-httpd_responses.h
+ * @brief API for generating the various replies of the mint; these
+ *        functions are called TMH_RESPONSE_reply_ and they generate
+ *        and queue MHD response objects for a given connection.
+ * @author Florian Dold
+ * @author Benedikt Mueller
+ * @author Christian Grothoff
+ */
+#ifndef TALER_MINT_HTTPD_RESPONSES_H
+#define TALER_MINT_HTTPD_RESPONSES_H
+#include <gnunet/gnunet_util_lib.h>
+#include <jansson.h>
+#include <microhttpd.h>
+#include <pthread.h>
+
+/**
+ * Send JSON object as response.
+ *
+ * @param connection the MHD connection
+ * @param json the json object
+ * @param response_code the http response code
+ * @return MHD result code
+ */
+int
+TMH_RESPONSE_reply_json (struct MHD_Connection *connection,
+                         const json_t *json,
+                         unsigned int response_code);
+
+
+/**
+ * Function to call to handle the request by building a JSON
+ * reply from a format string and varargs.
+ *
+ * @param connection the MHD connection to handle
+ * @param response_code HTTP response code to use
+ * @param fmt format string for pack
+ * @param ... varargs
+ * @return MHD result code
+ */
+int
+TMH_RESPONSE_reply_json_pack (struct MHD_Connection *connection,
+                              unsigned int response_code,
+                              const char *fmt,
+                              ...);
+
+
+/**
+ * Send a response indicating that the JSON was malformed.
+ *
+ * @param connection the MHD connection to use
+ * @return a MHD result code
+ */
+int
+TMH_RESPONSE_reply_invalid_json (struct MHD_Connection *connection);
+
+/**
+ * Send a response indicating an internal error.
+ *
+ * @param connection the MHD connection to use
+ * @param hint hint about the internal error's nature
+ * @return a MHD result code
+ */
+int
+TMH_RESPONSE_reply_internal_error (struct MHD_Connection *connection,
+                                   const char *hint);
+/**
+ * Send a response indicating an external error.
+ *
+ * @param connection the MHD connection to use
+ * @param hint hint about the error's nature
+ * @return a MHD result code
+ */
+int
+TMH_RESPONSE_reply_external_error (struct MHD_Connection *connection,
+                                   const char *hint);
+/**
+ * Send a response indicating that the request was too big.
+ *
+ * @param connection the MHD connection to use
+ * @return a MHD result code
+ */
+int
+TMH_RESPONSE_reply_request_too_large (struct MHD_Connection *connection);
+
+/**
+ * Add headers we want to return in every response.
+ * Useful for testing, like if we want to always close
+ * connections.
+ *
+ * @param response response to modify
+ */
+void
+TMH_RESPONSE_add_global_headers (struct MHD_Response *response);
+
+#endif