Iyzipay\Model\PaymentCard::toPKIRequestString PHP Method

    public function toPKIRequestString()
    {
        return RequestStringBuilder::create()->append("cardHolderName", $this->getCardHolderName())->append("cardNumber", $this->getCardNumber())->append("expireYear", $this->getExpireYear())->append("expireMonth", $this->getExpireMonth())->append("cvc", $this->getCvc())->append("registerCard", $this->getRegisterCard())->append("cardAlias", $this->getCardAlias())->append("cardToken", $this->getCardToken())->append("cardUserKey", $this->getCardUserKey())->getRequestString();
    }