code: public OkCoinFuturesOrderResult getFuturesOrders(
        String orderIds, String symbol, FuturesContract contract) throws IOException {
  
      OkCoinFuturesOrderResult futuresOrder =
          okCoin.getFuturesOrders(apikey, orderIds, symbol, contract.getName(), signatureCreator());
      return returnOrThrow(futuresOrder);
    }
docs: 批量获取合约订单信息
  
  @param orderIds
  @param symbol
  @param contract
  @return
  @throws IOException