code: public WePayOrder queryByTransactionId(String transactionId){
          checkNotNullAndEmpty(transactionId, "transactionId");
          Map<String, String> queryParams = new TreeMap<>();
          put(queryParams, WepayField.TRANSACTION_ID, transactionId);
          return doQueryOrder(queryParams);
      }
docs: 根据微信订单号查询订单
  @param transactionId 微信订单号
  @return PayOrder对象，或抛WepayException