Response.php

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<?php
namespace Magento\Authorizenet\Model\Directpost;

use Magento\Authorizenet\Model\Response as AuthorizenetResponse;
use Magento\Framework\Encryption\Helper\Security;

class Response extends AuthorizenetResponse
{
    public function generateHash($merchantMd5, $merchantApiLogin, $amount, $transactionId)
    {
        if (!$amount) {
            $amount = '0.00';
        }

        return strtoupper(md5($merchantMd5 . $merchantApiLogin . $transactionId . $amount));
    }

    public function isValidHash($merchantMd5, $merchantApiLogin)
    {
        $hash = $this->generateHash($merchantMd5, $merchantApiLogin, $this->getXAmount(), $this->getXTransId());

        return Security::compareStrings($hash, $this->getData('x_MD5_Hash'));
    }

    public function isApproved()
    {
        return $this->getXResponseCode() == \Magento\Authorizenet\Model\Directpost::RESPONSE_CODE_APPROVED;
    }
}