Have you looked into using implicit grant flow? It doesn’t require the use of an external server: https://github.com/justintv/Twitch-API/blob/master/authentication.md#implicit-grant-flow
Have you looked into using implicit grant flow? It doesn’t require the use of an external server: https://github.com/justintv/Twitch-API/blob/master/authentication.md#implicit-grant-flow