The status of the fulfillment event. Valid values:

attempted_delivery: Delivery of the shipment was attempted, but unable to be completed.
carrier_picked_up: A carrier picked up the shipment.
confirmed: The carrier is aware of the shipment, but hasn't received it yet.
delayed: The shipment is delayed.
delivered: The shipment was successfully delivered.
failure: Something went wrong when pulling tracking information for the shipment. For example, the tracking number was invalid or the shipment was canceled.
in_transit: The shipment is being transported between shipping facilities on the way to its destination.
label_printed: A label for the shipment was purchased and printed.
label_purchased: A label for the shipment was purchased, but not printed.
out_for_delivery: The shipment is being delivered to its final destination.
picked_up: The shipment was successfully picked up.
ready_for_pickup: The shipment is ready for pickup.