CvvEmsCodeMapper.php

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<?php
namespace Magento\Paypal\Model\Payflow;

use Magento\Payment\Api\PaymentVerificationInterface;
use Magento\Paypal\Model\Config;
use Magento\Paypal\Model\Info;
use Magento\Sales\Api\Data\OrderPaymentInterface;

class CvvEmsCodeMapper implements PaymentVerificationInterface
{
    private static $notProvidedCode = 'P';

    private static $cvvMap = [
        'Y' => 'M',
        'N' => 'N'
    ];

    public function getCode(OrderPaymentInterface $orderPayment)
    {
        if ($orderPayment->getMethod() !== Config::METHOD_PAYFLOWPRO) {
            throw new \InvalidArgumentException(
                'The "' . $orderPayment->getMethod() . '" does not supported by Payflow CVV mapper.'
            );
        }

        $additionalInfo = $orderPayment->getAdditionalInformation();
        if (empty($additionalInfo[Info::PAYPAL_CVV2MATCH])) {
            return self::$notProvidedCode;
        }

        $cvv = $additionalInfo[Info::PAYPAL_CVV2MATCH];

        return isset(self::$cvvMap[$cvv]) ? self::$cvvMap[$cvv] : self::$notProvidedCode;
    }
}