How to get access token?

API
6

As documented you need to make a POST request, you did a GET request

1) On your server, get an app access token by making this request:

POST https://id.twitch.tv/oauth2/token
    ?client_id=<your client ID>
    &client_secret=<your client secret>
    &grant_type=client_credentials
    &scope=<space-separated list of scopes>
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