This endpoint assigns an order to a driver. Call it once the user has confirmed the order and the driver.
Find the driverId with GET api/v1/drivers/search and check its driverStatus first: an Offline driver can
still be assigned. Assigning an order that already has another driver replaces that driver. The assignment
is refused with a message for, among others, a routed, multi-segment, delivered, cancelled, invoiced or
on-hold order, an unknown or archived driver, or a driver with missing attributes, expired documents, failed
certifications or not enough capacity. Assigning notifies the driver and the replaced driver, and may email
or text the order contacts; when the driver profile auto-accepts dispatched orders, the order is also
accepted. On success the response has no body; an unknown orderId returns a 404. Send no request body.