Order lifecycle

Every status change arrives as an event on the private stream. The status you read over REST is a snapshot of the same state.

Every order starts PENDING. A resting order is OPEN. The right column holds the three final states.

open means the order is resting. Any fills that matched when it entered the book arrive first.
A partial fill keeps the order OPEN and shrinks remaining.
cancel means you canceled the order, it expired, or we voided it. An IOC order that fills in part cancels the rest.
reject means we refused the order after accepting it. An IOC, FOK, or PO order that fills nothing is rejected.

Status	Means	Terminal
`PENDING`	Accepted, waiting on the exchange
`OPEN`	Resting on the book
`FILLED`	Completely filled	✓
`CANCELED`	Left the book unfilled or partly filled	✓
`REJECTED`	Refused after acceptance	✓

There’s no PARTIALLY_FILLED status. Track remaining instead.

Track order state

Subscribe first

Subscribe to orders on the private stream before you place an order.

Take a snapshot

Take a snapshot of your open orders and its sequence number, seq.

Apply events in order

Apply events in seq order. If you see a gap, take a new snapshot.

Key on orderId

Key your state on orderId.