How do you intergrate with Twitch and Unity game/app?

Unity Engine
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1

I have tried to use TwitchLib, but it uses a more advanced version of .net, making it almost impossible to use using Unity that support only old .net technology.

So what you use to communicate with Twitch’s API in Unity?

2

Definitely start at the twitch developers page, or else use the one in the asset store:

They have a support page linked there.