public function authenticationURL()
    {
        $clientId = config('twitch-api.client_id');
        $scopes = implode('+', config('twitch-api.scopes'));
        $redirectURL = config('twitch-api.redirect_url');

        return config('twitch-api.api_url') . '/kraken/oauth2/authorize?response_type=code&client_id=' . $clientId . '&redirect_uri=' . $redirectURL . '&scope=' . $scopes;
    }