function _valid_perform(&$request, &$response)
	{
		parent :: _valid_perform(&$request, &$response);
		
		if($request->is_success())
			$response->redirect('/root/cart?action=checkout&popup=1');
	}
 function _valid_perform()
 {
     $response = parent::_valid_perform();
     if ($response->is_success()) {
         return new redirect_response($response->get_status(), '/root/cart?action=checkout&popup=1');
     } else {
         return $response;
     }
 }