Overtrue\LaravelSocialite\ServiceProvider::register PHP Метод

    public function register()
    {
        $this->app->singleton('Overtrue\\Socialite\\SocialiteManager', function ($app) {
            $config = array_merge(config('socialite', []), config('services', []));
            return new SocialiteManager($config, $app->make('request'));
        });
    }