API and custom portal.

[oza4h07]

I'm learning Unifi-API-Client and I have several basic questions.

1. When implementing a custom portal, before a wifi guest is authorized, is it correct
   to say custom portal directly communicate with AP ?

2. Function authorize_guest() requires a MAC address to be passed.
   How do you get such data, when implementing a custom portal ?
   Is it something that is sent in HTTP request ?
   If negative, how can you get it ?

3. Are all guests, authorized though authorize_guest(), visible in stat_auths() output ?

Best regards