I believe you would have to bypass the built in captive portal page to do this. (Or maybe not. Depending how you want to do it.) You could setup a web server inside that zone that would handle the user authentication using the UserID-API and PHP. The user would just have to remember the web server DNS name/IP address to get back to the log off link. Just make sure your security policy has the source user set to either the specific user/group or known user.
The short answer is it's possible. :smileyhappy:
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