In a course create a lesson with just one question page. Enrol one user as teacher in the course where the lesson is. As admin, enable "Mobile services": Site administration ► Mobile app ► Mobile settings Create a Token for the teacher user Click on Site administration ► Plugins ► Web services ► Manage tokens Next, you can do a CURL REST call simulating a WS client with the teacher user token. You need to replace the wstoken, lessonid (the lesson instance value) curl 'http://localhost/m/stable_master/webservice/rest/server.php?moodlewsrestformat=json' --data 'lessonid=4&wsfunction=mod_lesson_get_attempts_overview&wstoken=a70d553bbaf6d9b260a9e5c701b3c46e&moodlewssettingfilter=true' | python -m "json.tool" Now check that in the information returned you only see a warnings array (empty). You should check that you don't see a field called 'data' in the curl response