Note: Version number is bumped because a new web service is added into the Mobile app service. Create a course with a student and and two teachers Create a forum with ratings enabled (choose aggregation type): Ratings ► Aggregate type ( Average of ratings, for example ) and scale Points (Max 100 points) As student add a topic to the forum As teacher1 rate that topic As teacher2 rate that topic (giving a different rate value) Enable "Mobile services": Plugins ► Web Services ► Mobile Create a Token for the teacher1 : Click on Site administration ► Plugins ► Web services ► Manage tokens Next, you can do a CURL request simulating a WS client with the teacher1 user You need to replace the wstoken, instanceid, itemid and the URL of your moodle instance. instanceid: The course module id itemid: The discussion id (where the ratigns are) curl 'http://localhost/m/stable_master/webservice/rest/server.php?moodlewsrestformat=json' --data 'contextlevel=module&instanceid=85&component=mod_forum&ratingarea=post&itemid=28&scaleid=100&sort=fullname&wsfunction=core_rating_get_item_ratings&wstoken=a70d553bbaf6d9b260a9e5c701b3c46e' Confirm that: You receive a list with all the ratings for the discussion Use an invalid itemid (like 0) you will receive an empty list Use an invalid ratingarea, you will receive a empty list Use an invalid instanceid, you will receive an iinvalid_parameter_exception error, contest does not exists