Note: Version number is bumped because a new web service is added into the Mobile app service. create a course with a choice/activity create 3 possible options for this choice enroll student1 to this course As student1 call mod_choice_sumbit_choice_response() using a curl call as in the following example: Create a Token for the Student1: Click on Site administration ► Plugins ► Web services ► Manage tokens Next, you can do a couple of CURL REST call simulating a WS client as Student curl 'http://localhost/m/stable_master/webservice/rest/server.php?moodlewsrestformat=json' -H 'Pragma: no-cache' -H 'Origin: file:// ' -H 'Accept-Encoding: gzip,deflate,sdch' -H 'Accept-Language: es,en;q=0.8,de-DE;q=0.6,de;q=0.4,nb;q=0.2' -H 'User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1798.0 Safari/537.36' -H 'Content-Type: application/x-www-form-urlencoded; charset=UTF-8' -H 'Accept: application/json, text/javascript, / ; q=0.01' -H 'Cache-Control: no-cache' -H 'Connection: keep-alive' --data 'wsfunction=mod_choice_submit_choice_response&choiceinstanceid=1&responses[]=3&wstoken=19d196c6b5e94efb8c84dd534c1f9018' --compressed The webservice should return this kind of result: {"answers":[{"id":12,"choiceid":1,"userid":8,"optionid":3,"timemodified":1433516029}],"warnings":[]} For each response you successfully submitted you will receive back those records the webservice just added into the answers table.