in a nutshell, I believe that currently the only way to subscribe to a channel is from the channel itself. But, if i want to subscribe on a channel from another website, and track it for analytics, could be possible?
The only avaiable ways to subscribe/run the payment flow are all on the Twitch website either on
Which are all the same to Twitch stat tracking (just different layouts used in different ways)
You think in future could be possible? if i want to promote my streming from my website, and people want to subscribe from my site (obivious still a normal Twitch subs) and i want to know how many people subs from my site, i can’t now, right? I hope in future they will change it
Then you need a uservoice for this https://twitch.uservoice.com/