Omnipay\Alipay\Requests\LegacyRefundRequest::getDetailData PHP Метод

    protected function getDetailData()
    {
        $strings = [];
        foreach ($this->getRefundItems() as $item) {
            $item = (array) $item;
            if (!isset($item['out_trade_no'])) {
                throw new InvalidRequestException('The field `out_trade_no` is not exist in item');
            }
            if (!isset($item['amount'])) {
                throw new InvalidRequestException('The field `amount` is not exist in item');
            }
            if (!isset($item['reason'])) {
                throw new InvalidRequestException('The field `reason` is not exist in item');
            }
            $strings[] = implode('^', [$item['out_trade_no'], $item['amount'], $item['reason']]);
        }
        return implode('#', $strings);
    }