Hi How Were you.
BUT!!
It’s honestly a pain in the ass with all the poorly explained documentation. If you would have stated it properly from the beginning, people wouldn’t be asking so many questions. You’ve got to do better than this.
The point that I don’t know where to refer to client_secret of Get an OAuth token.
curl -X POST "https://id.twitch.tv/oauth2/token" ^
-H "Content-Type: application/x-www-form-urlencoded" ^
-d "client_id=<your client id goes here>&client_secret=<your client secret goes here>&grant_type=client_credentials"
Please refer to the Authentication Documentation. It explains how to create an app, where to find your client id and client secret, and what HTTP requests you need to make.
It even includes example apps in Node.js and Go, and the step by step walk through of each OAuth flow includes a table of what params are needed, example requests, and examples responses.