Trying to get a Oath token for a chrome extension

API
2

You need to include the redirect URL in the authorization link. See documentation.

https://api.twitch.tv/kraken/oauth2/authorize
    ?response_type=code
    &client_id=[your client ID]
    &redirect_uri=[your registered redirect URI]
    &scope=[space separated list of scopes]
    &state=[your provided unique token]