App\Http\Controllers\Auth\TwitterOAuthController::handleProviderCallback PHP Method

    public function handleProviderCallback()
    {
        try {
            $user = Socialite::driver('twitter')->user();
        } catch (Exception $e) {
            return redirect('auth/twitter');
        }
        $authUser = $this->findOrCreateUser($user);
        Auth::login($authUser, true);
        return redirect('app/');
    }