This is no longer possible, simply
You require either:
a) a backend to make the Call to Twitch using an App Access Token
b) login the user using implicit auth, then using that token to make the call to Twitch
This is no longer possible, simply
You require either:
a) a backend to make the Call to Twitch using an App Access Token
b) login the user using implicit auth, then using that token to make the call to Twitch