CvvEmsCodeMapper.php

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<?php
namespace Magento\Braintree\Model;

use Magento\Braintree\Gateway\Response\PaymentDetailsHandler;
use Magento\Braintree\Model\Ui\ConfigProvider;
use Magento\Payment\Api\PaymentVerificationInterface;
use Magento\Sales\Api\Data\OrderPaymentInterface;

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

    private static $cvvMap = [
        'M' => 'M',
        'N' => 'N',
        'U' => 'P',
        'I' => 'P',
        'S' => 'S',
        'A' => ''
    ];

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

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

        $cvv = $additionalInfo[PaymentDetailsHandler::CVV_RESPONSE_CODE];
        return isset(self::$cvvMap[$cvv]) ? self::$cvvMap[$cvv] : self::$notProvidedCode;
    }
}