ReadonlyactionOptional ReadonlyexpiresDate and time (UTC) the Recurring Order should expire. If empty, any existing value will be removed.
If the date or time is extended or removed when the [RecurringOrderState](ctp:api:type:RecurringOrderState) is `Expired`, the state will be updated to `Active`.
Setting the expiration date and time generates the RecurringOrderExpiresAtSet Message.