As admin set the admin setting sitepolicy: Add a link to a web page Enable the e-mail based self registration auth plugin Set the admin setting registerauth to Email-based self registration Then, execute the following curl request: curl 'http://localhost/m/stable_master/lib/ajax/service.php' --data-binary ' [{"index":0,"methodname":"auth_email_get_signup_settings","args":{}}] ' | python -m "json.tool" And check that among all the fields in the response you see the sitepolicy field correctly set to the web page you used in step 1 As admin set the admin setting sitepolicy again, but now use a random string as value, something like "abcdef" Execute the curl request again and check that you receive the sitepolicy again with the value you used in the previous step