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diff --git a/src/templating/mustach-jansson.h b/src/templating/mustach-jansson.h
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+++ b/src/templating/mustach-jansson.h
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+/*
+ Copyright (C) 2020 Taler Systems SA
+
+ Original license:
+ Author: José Bollo <jose.bollo@iot.bzh>
+ Author: José Bollo <jobol@nonadev.net>
+
+ https://gitlab.com/jobol/mustach
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+#ifndef _mustach_jansson_h_included_
+#define _mustach_jansson_h_included_
+
+#include <taler/taler_json_lib.h>
+#include "mustach.h"
+
+/**
+ * fmustach_jansson - Renders the mustache 'template' in 'file' for 'root'.
+ *
+ * @template: the template string to instantiate
+ * @root:     the root json object to render
+ * \@file:     the file where to write the result
+ *
+ * Returns 0 in case of success, -1 with errno set in case of system error
+ * a other negative value in case of error.
+ */
+extern int fmustach_jansson(const char *template, json_t *root, FILE *file);
+
+/**
+ * fmustach_jansson - Renders the mustache 'template' in 'fd' for 'root'.
+ *
+ * @template: the template string to instantiate
+ * @root:     the root json object to render
+ * @fd:       the file descriptor number where to write the result
+ *
+ * Returns 0 in case of success, -1 with errno set in case of system error
+ * a other negative value in case of error.
+ */
+extern int fdmustach_jansson(const char *template, json_t *root, int fd);
+
+
+/**
+ * fmustach_jansson - Renders the mustache 'template' in 'result' for 'root'.
+ *
+ * @template: the template string to instantiate
+ * @root:     the root json object to render
+ * @result:   the pointer receiving the result when 0 is returned
+ * @size:     the size of the returned result
+ *
+ * Returns 0 in case of success, -1 with errno set in case of system error
+ * a other negative value in case of error.
+ */
+extern int mustach_jansson(const char *template, json_t *root, char **result, size_t *size);
+
+/**
+ * umustach_jansson - Renders the mustache 'template' for 'root' to custom writer 'writecb' with 'closure'.
+ *
+ * @template: the template string to instantiate
+ * @root:     the root json object to render
+ * @writecb:  the function that write values
+ * @closure:  the closure for the write function
+ *
+ * Returns 0 in case of success, -1 with errno set in case of system error
+ * a other negative value in case of error.
+ */
+typedef int (*mustach_jansson_write_cb)(void *closure, const char *buffer, size_t size);
+extern int umustach_jansson(const char *template, json_t *root, mustach_jansson_write_cb writecb, void *closure);
+
+#endif
+