docs: public CexIOOrder placeCexIOMarketOrder(MarketOrder marketOrder) throws IOException {
      CexIOOrder order =
          cexIOAuthenticated.placeOrder(
              signatureCreator,
              marketOrder.getCurrencyPair().base.getCurrencyCode(),
              marketOrder.getCurrencyPair().counter.getCurrencyCode(),
              new CexioPlaceOrderRequest(
                  (marketOrder.getType() == BID ? CexIOOrder.Type.buy : CexIOOrder.Type.sell),
                  null,
                  marketOrder.getOriginalAmount(),
                  "market"));
      if (order.getErrorMessage() != null) {
        throw new ExchangeException(order.getErrorMessage());
      }
      return order;
    }