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

    private static $avsMap = [
        'MM' => 'Y',
        'NM' => 'A',
        'MN' => 'Z',
        'NN' => 'N',
        'UU' => 'U',
        'II' => 'U',
        'AA' => 'E'
    ];

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

        $additionalInfo = $orderPayment->getAdditionalInformation();
        if (empty($additionalInfo[PaymentDetailsHandler::AVS_POSTAL_RESPONSE_CODE]) ||
            empty($additionalInfo[PaymentDetailsHandler::AVS_STREET_ADDRESS_RESPONSE_CODE])
        ) {
            return self::$unavailableCode;
        }

        $streetCode = $additionalInfo[PaymentDetailsHandler::AVS_STREET_ADDRESS_RESPONSE_CODE];
        $zipCode = $additionalInfo[PaymentDetailsHandler::AVS_POSTAL_RESPONSE_CODE];
        $key = $zipCode . $streetCode;
        return isset(self::$avsMap[$key]) ? self::$avsMap[$key] : self::$unavailableCode;
    }
}