Iyzipay\Request\CreateRefundRequest::toPKIRequestString PHP Method

    public function toPKIRequestString()
    {
        return RequestStringBuilder::create()->appendSuper(parent::toPKIRequestString())->append("paymentTransactionId", $this->getPaymentTransactionId())->appendPrice("price", $this->getPrice())->append("ip", $this->getIp())->append("currency", $this->getCurrency())->getRequestString();
    }