Use Twitch PubSub API
Creating a Unity Asset to allow Unity developers to make interactive projects that allow viewers in a Twitch chat room to manipulate the game/application. Add to the above statement this project adds PubSub access
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Twitch API Helix Twitch Authentication
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Twitch Developer ConsoleDeveloper Console
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PubSub GuideTwitch PubSub
C# Solusion - Download and include in your peojectMIT