支付宝部分退款不成功问题

修改文件：extend/service/AlipayTradeWapService

修改方法：AliPayRefund

    public function AliPayRefund($out_trade_no, $trade_no, $refund_amount, $refund_reason, $passback_params)
    {
        $out_request_no = mb_substr($out_trade_no, 2);
        $request = new \AlipayTradeRefundRequest();
        $request->setBizContent(self::setBizContent(compact('out_trade_no', 'trade_no', 'refund_amount', 'refund_reason', 'passback_params', 'out_request_no')));
        $result = self::AopclientRequestExecute($request);
        $responseNode = str_replace(".", "_", $request->getApiMethodName()) . "_response";
        $resultCode = $result->$responseNode->code;
        return $resultCode;
    }