Create a course with a database using the image gallery preset Enable "Mobile services": Site administration ► Mobile app ► Mobile settings Create a Token in the mobile app service for a student enrolled in the course where the database is: Click on Site administration ► Plugins ► Web services ► Manage tokens Next, you can do a CURL REST call simulating a WS client with the student token. You need to replace the wstoken, databaseid (with the database instance id) and the URL of your moodle instance curl 'http://localhost/m/stable_master/webservice/rest/server.php?moodlewsrestformat=json' --data 'databaseid=13&wsfunction=mod_data_get_fields&wstoken=12a2a65aeea2a177055e233f9e303218&moodlewssettingfilter=true' | python -m "json.tool" Now check that you receive correctly the list of fields that the database is using (in this case the fields for the image gallery preset) You can compare the information returned by the WS with the records in the data_fields table in the Moodle DB for the database activity.