XmlToArrayConverter.php

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<?php
declare(strict_types=1);

namespace Magento\Payment\Gateway\ErrorMapper;

use Magento\Framework\Config\ConverterInterface;

class XmlToArrayConverter implements ConverterInterface
{
    public function convert($source)
    {
        $result = [];
        $messageList = $source->getElementsByTagName('message');
        foreach ($messageList as $messageNode) {
            $result[(string) $messageNode->getAttribute('code')] = (string) $messageNode->nodeValue;
        }
        return $result;
    }
}