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diff --git a/src/mint/taler-mint-httpd_parsing.h b/src/mint/taler-mint-httpd_parsing.h
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+/*
+  This file is part of TALER
+  (C) 2014 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-mint-httpd_parsing.h
+ * @brief functions to parse incoming requests
+ * @author Florian Dold
+ * @author Benedikt Mueller
+ * @author Christian Grothoff
+ */
+
+#ifndef TALER_MICROHTTPD_LIB_H_
+#define TALER_MICROHTTPD_LIB_H_
+
+
+#include <microhttpd.h>
+#include <jansson.h>
+
+
+/**
+ * Constants for JSON navigation description.
+ */
+enum
+{
+  /**
+   * Access a field.
+   * Param: const char *
+   */
+  JNAV_FIELD,
+  /**
+   * Access an array index.
+   * Param: int
+   */
+  JNAV_INDEX,
+  /**
+   * Return base32crockford encoded data of
+   * constant size.
+   * Params: (void *, size_t)
+   */
+  JNAV_RET_DATA,
+  /**
+   * Return base32crockford encoded data of
+   * variable size.
+   * Params: (void **, size_t *)
+   */
+  JNAV_RET_DATA_VAR,
+  /**
+   * Return a json object, which must be
+   * of the given type (JSON_* type constants,
+   * or -1 for any type).
+   * Params: (int, json_t **)
+   */
+  JNAV_RET_TYPED_JSON
+};
+
+
+/**
+ * Process a POST request containing a JSON object.
+ *
+ * @param connection the MHD connection
+ * @param con_cs the closure (contains a 'struct Buffer *')
+ * @param upload_data the POST data
+ * @param upload_data_size the POST data size
+ * @param json the JSON object for a completed request
+ *
+ * @returns
+ *    GNUNET_YES if json object was parsed
+ *    GNUNET_NO is request incomplete or invalid
+ *    GNUNET_SYSERR on internal error
+ */
+int
+process_post_json (struct MHD_Connection *connection,
+                   void **con_cls,
+                   const char *upload_data,
+                   size_t *upload_data_size,
+                   json_t **json);
+
+
+/**
+ * Navigate through a JSON tree.
+ *
+ * Sends an error response if navigation is impossible (i.e.
+ * the JSON object is invalid)
+ *
+ * @param connection the connection to send an error response to
+ * @param root the JSON node to start the navigation at.
+ * @param ... navigation specification (see JNAV_*)
+ * @return GNUNET_YES if navigation was successful
+ *         GNUNET_NO if json is malformed, error response was generated
+ *         GNUNET_SYSERR on internal error
+ */
+int
+request_json_require_nav (struct MHD_Connection *connection,
+                          const json_t *root, ...);
+
+
+
+
+/**
+ * Extraxt 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 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
+TALER_MINT_mhd_request_arg_data (struct MHD_Connection *connection,
+                          const char *param_name,
+                          void *out_data,
+                          size_t out_size);
+
+
+
+
+#endif /* TALER_MICROHTTPD_LIB_H_ */