Create a course Note the ID of the course Enrol two users as students in the course Suspend enrolment for one of the students Enrol another user as a Teacher Enable the Mobile App from Site admin -> Mobile app -> Mobile settings Navigate to Site admin -> Plugins -> Web services -> Manage tokens Create a token for the teacher and note the token Make a webservice call to retrieve all users. You can do so with a curl request like: curl "{ADDRESS_HERE}/webservice/rest/server.php?wstoken={TOKEN_HERE}&wsfunction=core_enrol_get_enrolled_users&moodlewsrestformat=json&courseid={COURSEID}" | json_pp - Confirm that all three users were retrieved Make a webservice call to retrieve only active users  curl "[ADDRESS_HERE]/webservice/rest/server.php?wstoken=[TOKEN_HERE]&wsfunction=core_enrol_get_enrolled_users&moodlewsrestformat=json&courseid=[COURSEID]&options[1][name]=onlyactive&options[1][value]=true" | json_pp - Confirm that only the two active users were retrieved Make a webservice call to retrieve only suspended users  curl "[ADDRESS_HERE]/webservice/rest/server.php?wstoken=[TOKEN_HERE]&wsfunction=core_enrol_get_enrolled_users&moodlewsrestformat=json&courseid=[COURSEID]&options[0][name]=onlysuspended&options[0][value]=true" | json_pp - Confirm that only the one suspended user was retrieved Make a webservice call that tries to get only active and only suspended at the same time (so two parameters are passed)  curl "[ADDRESS_HERE]/webservice/rest/server.php?wstoken=[TOKEN_HERE]&wsfunction=core_enrol_get_enrolled_users&moodlewsrestformat=json&courseid=[COURSEID]&options[0][name]=onlysuspended&options[0][value]=true&options[1][name]=onlyactive&options[1][value]=true" | json_pp - Confirm that an exception was thrown   Both onlyactive and onlysuspended are set, this is probably not what you want!