The set of valid states for an order.
The cart is active. Items can only be added, deleted, or updated in the cart when status is Active.
The cart is invalid; it does not exist. An example is a cart that has expired.
The order is completed.
The cart was cancelled.
The order was shipped. Half.com users can specify this in the GetOrders input.
The cart was authenticated.
After placing the order and before completion of checkout, the card is "in process."
Reserved for internal or future use.