Iyzipay\Request\CreateBkmInitializeRequest::toPKIRequestString PHP Method

    public function toPKIRequestString()
    {
        return RequestStringBuilder::create()->appendSuper(parent::toPKIRequestString())->appendPrice("price", $this->getPrice())->append("basketId", $this->getBasketId())->append("paymentGroup", $this->getPaymentGroup())->append("buyer", $this->getBuyer())->append("shippingAddress", $this->getShippingAddress())->append("billingAddress", $this->getBillingAddress())->appendArray("basketItems", $this->getBasketItems())->append("callbackUrl", $this->getCallbackUrl())->append("paymentSource", $this->getPaymentSource())->getRequestString();
    }