Your response_type is force_verify
it should be code for this example
Line 27 of this example shows a URL being constructed.
ClientID’s are public there is no need to hide this
Should be
https://id.twitch.tv/oauth2/authorize?client_id=<myid>&redirect_uri=http://plox.nu/oauth/callback.php&response_type=code&scope=bits:read
You can optionally add
https://id.twitch.tv/oauth2/authorize?client_id=<myid>&redirect_uri=http://plox.nu/oauth/callback.php&response_type=code&scope=bits:read&force_verify=true
if you need Force Verify