code: public OkCoinPositionResult getFuturesPosition(String symbol, FuturesContract contract)
        throws IOException {
      OkCoinPositionResult futuresPositionsCross =
          okCoin.getFuturesPositionsCross(apikey, symbol, contract.getName(), signatureCreator());
  
      return returnOrThrow(futuresPositionsCross);
    }
docs: 获取用户持仓获取OKEX合约账户信息 （全仓）
  
  @param symbol
  @param contract
  @return
  @throws IOException