AvsEmsCodeMapper.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 AvsEmsCodeMapper implements PaymentVerificationInterface
{
    private static $unavailableCode = '';

    private static $avsMap = [
        'YY' => 'Y',
        'NY' => 'A',
        'YN' => 'Z',
        'NN' => 'N'
    ];

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

        $additionalInfo = $orderPayment->getAdditionalInformation();
        if (empty($additionalInfo[Info::PAYPAL_AVSADDR]) ||
            empty($additionalInfo[Info::PAYPAL_AVSZIP])
        ) {
            return self::$unavailableCode;
        }

        $streetCode = $additionalInfo[Info::PAYPAL_AVSADDR];
        $zipCode = $additionalInfo[Info::PAYPAL_AVSZIP];
        $key = $zipCode . $streetCode;

        return isset(self::$avsMap[$key]) ? self::$avsMap[$key] : self::$unavailableCode;
    }
}