Records a sale. Closing part of a lot splits it: the closed quantity becomes its own closed row and the remainder stays open on its original cost basis, so a later close of the rest is still priced against what was actually paid for it. The response carries the CLOSED lot, whose id differs from the original one after a partial close.

Price per share the position was closed at, always positive — received for a long, paid to cover a short. For an option, the premium per share of the underlying.

The date it was closed, yyyy-MM-dd. Cannot be before the lot was acquired.

How much to close, unsigned. Omit to close the whole lot; pass less to close part of it.

True when this request repeated an add that had already landed, so nothing was created and the existing lot is returned. A client that retried a timed-out request reads this instead of discovering a second holding. The response is 200 rather than 201.