Barry, I think I am missing something.
Using the Implicit, I get back this:
https://localhost#access_token=0123456789abcdefghijABCDEFGHIJ
&scope=viewing_activity_read
&state=c3ab8aa609ea11e793ae92361f002671
&token_type=bearer
So how can I use this to check if A is my sub?
I obviously have MY client ID but I have not the one of the person who is logging, right?
If the call is this
GET https://api.twitch.tv/kraken/users/<user ID>/subscriptions/<channel ID>
I need to know both user ids