vendor/codeages/omnipay-alipay/src/Responses/AbstractResponse.php

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<?php

namespace Omnipay\Alipay\Responses;

use Omnipay\Common\Message\AbstractResponse as Response;
abstract class AbstractResponse extends \Omnipay\Common\Message\AbstractResponse
{
    public function data($key = null, $default = null)
    {
        if (is_null($key)) {
            return $this->data;
        } else {
            return array_get($this->data, $key, $default);
        }
    }
}