code: private function  setUrl($orderId, $payReturnId = null)
  	{
  		$this->url = Gateway::getConfig('gateUrl') . Gateway::getConfig('shopId')
  			. '/bills/' . $orderId;
  		if ($payReturnId != null) {
  			$this->url .= '/refund/' . $payReturnId;
  		}
  
  	}
docs: Определяет URL для curl запроса
  
  @param $orderId
  @param $payReturnId