code: protected function returnTo()
      {
          // Set in AuthShop middleware
          $return_to = Session::get('return_to');
          if ($return_to) {
              Session::forget('return_to');
  
              return Redirect::to($return_to);
          }
  
          // No return_to, go to home route
          return Redirect::route('home');
      }
docs: Determines where to redirect after successfull auth.
  
  @return string