Iyzipay\Request\CreateCrossBookingRequest::toPKIRequestString PHP Метод

    public function toPKIRequestString()
    {
        return RequestStringBuilder::create()->appendSuper(parent::toPKIRequestString())->append("subMerchantKey", $this->getSubMerchantKey())->appendPrice("price", $this->getPrice())->append("reason", $this->getReason())->append("currency", $this->getCurrency())->getRequestString();
    }