by Mayank Tyagi.
Hey Karishma,
If you want to add rest parameter for GET/POST you can do it by this.
http://example.com/webservice/rest/server.php?wstoken=4d58eb874d279fd220e9&wsfunction=location_webservices_create_variant&moodlewsrestformat=json&group_idnumber=97&name=Full Week&course_idnumber=toefl&location_idnumber=99