code: public String placeLimitOrderUnrestricted(LimitOrder limitOrder) {
      MatchingEngine engine = exchange.getEngine(limitOrder.getCurrencyPair());
      return engine.postOrder(getApiKey(), limitOrder).getId();
    }
docs: Use instead of {@link #placeLimitOrder(LimitOrder)} to bypass rate limitations and transient
  errors when building up a simulated order book.
  
  @param limitOrder The limit order.
  @return The id of the resulting order.