Create a course with a student. The course must have at least one section. Add and assignment with submission comments. As the student submit and add some comments to the submission comments. As admin, enable "Mobile services": Plugins ► Web Services ► Mobile Create a Token for the student user. Click on Site administration ► Plugins ► Web services ► Manage tokens Take note of the student token (to be used in following instructions). Next, you can do a CURL REST call simulating a WS client with the student user. You need to replace the wstoken, instanceid, itemid and the URL of your moodle instance. Where: wstoken is the token of the student user you created. instanceid is the coursemodule id of the assignment. itemid is the submission id. curl 'http://localhost/m/stable_master/webservice/rest/server.php?moodlewsrestformat=json' --data 'wsfunction=core_comment_get_comments&contextlevel=module&component=assignsubmission_comments&area=submission_comments&page=0&instanceid=72&itemid=34&wstoken=cd2be328e7db5fefa407274d1e1073a7' --compressed Confirm that the comments info is returned.