code: public OkCoinFuturesUserInfoCross getFutureUserInfo() throws IOException {
  
      OkCoinFuturesUserInfoCross futuresUserInfoCross =
          okCoin.getFuturesUserInfoCross(apikey, signatureCreator());
  
      return returnOrThrow(futuresUserInfoCross);
    }
docs: 获取OKEx合约账户信息(全仓)
  
  @return
  @throws IOException