docs: public static String generateMchPayNativeReplyXML(MchPayNativeReply mchPayNativeReply, String key) {
  		Map<String, String> map = MapUtil.objectToMap(mchPayNativeReply);
  		String sign = SignatureUtil.generateSign(map, key);
  		mchPayNativeReply.setSign(sign);
  		return XMLConverUtil.convertToXML(mchPayNativeReply);
  	}