You can do whole process with postman, you just need to configure like that
In your app on twitch, you need to write this callback url :
https://getpostman.com/oauth2/callback
On postman the same callback url
https://getpostman.com/oauth2/callback
On postman on Auth URL
https://id.twitch.tv/oauth2/authorize
On postman on Access Token URL
https://id.twitch.tv/oauth2/token
Don’t forget to switch to “Send client credential in body” on the last selector.
When you click to “Request token”, a web browser from postman is opened and do the whole twitch graphic process.
I got all my tokens for this
I will just send the postman collection to my streameur for run the process.
Thankx 