This is an api designed to help csharp modders with streamer integration. A sample program is provided, and the api is fully documented within the source.
The api is designed to use a robus event system, and whilst async events may cause synchronisation issues within your modding environment, (or any other csharp environment), working with IRC and REST requires it - lest the frame rate drops significantly. If you must, the code is modifiable to become synchronous.
How do I get a youtube api key? Goto https://console.cloud.google.com/, start a new project. Goto the api section, and enable the youtube data api v3. Goto the credentials section in api's, and make a new api key. You may also need to create a oauth client id.
How do I get a twitch oauth key? Goto here https://twitchapps.com/tmi/, and follow the instructions. You can also make your own twitch developer app, add a localhost:8080 redirect uri, and start a local python server with python -m http.server 8080 then navigate here on your browser, and read the auth key from the top of the 404 page at the end. https://id.twitch.tv/oauth2/authorize?client_id=[TWITCHCLIENTID]&response_type=token&redirect_uri=http://localhost:8080/&scope=chat%3Aread+chat%3Aedit