Create a course, enrol a user as student Create a quiz, configure it with at least 2 feedback boundaries (for exaple, 0-50% and 50%-100%) Add some questions to the quiz, and now as the student do the quiz (several attempts) and check that you see the quiz feedback according the boundaries. (is better to start failing the quiz to see the lower boundary feedback) 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 Next, you can do a CURL REST call simulating a WS client with the student user. You need to replace the wstoken, and the URL of your moodle instance curl 'http://localhost/m/stable_master/webservice/rest/server.php?moodlewsrestformat=json' --data 'quizid=10&grade=7.4&wsfunction=mod_quiz_get_quiz_feedback_for_grade&wstoken=ffbe3a3002f235bf9d01fd9369e10b66' | python -m "json.tool" Confirm that you see the correct feedback message when passing a grade (if you pass a grade 5 (when max grade is 10) you should see the message for the boundary 50%/100%)