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diff --git a/src/exchange/taler-exchange-httpd_parsing.h b/src/exchange/taler-exchange-httpd_parsing.h
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+++ b/src/exchange/taler-exchange-httpd_parsing.h
@@ -0,0 +1,139 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2014, 2015, 2016 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-exchange-httpd_parsing.h
+ * @brief functions to parse incoming requests
+ * @author Florian Dold
+ * @author Benedikt Mueller
+ * @author Christian Grothoff
+ */
+#ifndef TALER_EXCHANGE_HTTPD_PARSING_H
+#define TALER_EXCHANGE_HTTPD_PARSING_H
+
+#include <microhttpd.h>
+#include <jansson.h>
+#include "taler_util.h"
+#include "taler_json_lib.h"
+
+
+/**
+ * Process a POST request containing a JSON object.  This
+ * function realizes an MHD POST processor that will
+ * (incrementally) process JSON data uploaded to the HTTP
+ * server.  It will store the required state in the
+ * "connection_cls", which must be cleaned up using
+ * #TMH_PARSE_post_cleanup_callback().
+ *
+ * @param connection the MHD connection
+ * @param con_cls the closure (points to a `struct Buffer *`)
+ * @param upload_data the POST data
+ * @param upload_data_size number of bytes in @a upload_data
+ * @param json the JSON object for a completed request
+ * @return
+ *    #GNUNET_YES if json object was parsed or at least
+ *               may be parsed in the future (call again);
+ *               `*json` will be NULL if we need to be called again,
+ *                and non-NULL if we are done.
+ *    #GNUNET_NO is request incomplete or invalid
+ *               (error message was generated)
+ *    #GNUNET_SYSERR on internal error
+ *               (we could not even queue an error message,
+ *                close HTTP session with MHD_NO)
+ */
+int
+TMH_PARSE_post_json (struct MHD_Connection *connection,
+                     void **con_cls,
+                     const char *upload_data,
+                     size_t *upload_data_size,
+                     json_t **json);
+
+
+/**
+ * Function called whenever we are done with a request
+ * to clean up our state.
+ *
+ * @param con_cls value as it was left by
+ *        #TMH_PARSE_post_json(), to be cleaned up
+ */
+void
+TMH_PARSE_post_cleanup_callback (void *con_cls);
+
+
+/**
+ * Parse JSON object into components based on the given field
+ * specification.
+ *
+ * @param connection the connection to send an error response to
+ * @param root the JSON node to start the navigation at.
+ * @param spec field specification for the parser
+ * @return
+ *    #GNUNET_YES if navigation was successful (caller is responsible
+ *                for freeing allocated variable-size data using
+ *                #GNUNET_JSON_parse_free() when done)
+ *    #GNUNET_NO if json is malformed, error response was generated
+ *    #GNUNET_SYSERR on internal error
+ */
+int
+TMH_PARSE_json_data (struct MHD_Connection *connection,
+                     const json_t *root,
+                     struct GNUNET_JSON_Specification *spec);
+
+
+/**
+ * Parse JSON array into components based on the given field
+ * specification.  Generates error response on parse errors.
+ *
+ * @param connection the connection to send an error response to
+ * @param root the JSON node to start the navigation at.
+ * @param[in,out] spec field specification for the parser
+ * @param ... -1-terminated list of array offsets of type 'int'
+ * @return
+ *    #GNUNET_YES if navigation was successful (caller is responsible
+ *                for freeing allocated variable-size data using
+ *                #GNUNET_JSON_parse_free() when done)
+ *    #GNUNET_NO if json is malformed, error response was generated
+ *    #GNUNET_SYSERR on internal error
+ */
+int
+TMH_PARSE_json_array (struct MHD_Connection *connection,
+                      const json_t *root,
+                      struct GNUNET_JSON_Specification *spec,
+                      ...);
+
+
+/**
+ * Extraxt fixed-size base32crockford encoded data from request.
+ *
+ * Queues an error response to the connection if the parameter is missing or
+ * invalid.
+ *
+ * @param connection the MHD connection
+ * @param param_name the name of the parameter with the key
+ * @param[out] out_data pointer to store the result
+ * @param out_size expected size of @a out_data
+ * @return
+ *   #GNUNET_YES if the the argument is present
+ *   #GNUNET_NO if the argument is absent or malformed
+ *   #GNUNET_SYSERR on internal error (error response could not be sent)
+ */
+int
+TMH_PARSE_mhd_request_arg_data (struct MHD_Connection *connection,
+                                const char *param_name,
+                                void *out_data,
+                                size_t out_size);
+
+
+#endif /* TALER_EXCHANGE_HTTPD_PARSING_H */