IAVSResponse.php

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<?php
namespace Magento\Paypal\Model\Payflow\Service\Response\Validator;

use Magento\Framework\DataObject;
use Magento\Paypal\Model\Payflow\Service\Response\ValidatorInterface;
use Magento\Paypal\Model\Payflow\Transparent;

class IAVSResponse implements ValidatorInterface
{
    private static $iavs = 'iavs';

    private static $negativeResponseCode = 'y';

    public function validate(DataObject $response, Transparent $transparentModel)
    {
        $config = $transparentModel->getConfig();
        // the IAVS configuration setting is not enabled
        if (!$config->getValue('avs_international')) {
            return true;
        }

        if (strtolower((string) $response->getData(self::$iavs)) === self::$negativeResponseCode) {
            $response->setRespmsg('International AVS indicator does not match.');
            return false;
        }

        return true;
    }
}