Enable "Mobile services": Plugins ► Web Services ► Mobile Create a Token for the user (student) your are going to test with (and additional token for an admin user): Click on Site administration ► Plugins ► Web services ► Manage tokens Click add, select user and service (Mobile Service) Next, you can do a CURL REST call simulating a WS client: 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' -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 'Cookie: MoodleSession=6jl8pbg3ndu6j70h4a56k0aea4' -H 'Connection: keep-alive' --data 'wsfunction=core_webservice_get_site_info&wstoken=1b9cc9f44630b554bb2c9428b8744338' --compressed Confirm that: You receive a json response containing these three attributes: usercanmanageownfiles userquota usermaxuploadfilesize With the correct values for the site, you may change the userquota global config and also the maxbytes global config to check if the function returns correctly the new values. If you call the web service as admin, you will receive 0 (admin can ignores the quotas) as userquota and -1 as usermaxuploadfilesize (admin can ignore limits)