immediate-or-cancel orders These orders are placed by setting the timeInForce SubmitOrder.timeInForce to TimeInForce.IOC (immediate or cancel).
To cancel an order, call cancelOrder() method with the orderID or clOrdID of the order to be canceled. If the order is already filled or the Id is invalid, the cancellation will be rejected. Whisperer will instead respond with a OrderCancelRejected message that will contain the reason for rejection.
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