# description
A multi-dimensional update to an in-progress or upcoming mobility trip, covering contract modifications (added/removed services, route changes), status notifications (driver arriving, trip started), and real-time tracking endpoint information.

# properties.contractChanges.description
Items added or modified in the trip contract (new stop, route change, add-on service)

# properties.cancelledItems.description
Items removed from the original trip contract

# properties.stateUpdate.description
Status notification for the traveler (e.g. driver arriving, trip started, trip ended, driver changed)

# properties.trackingEndpoint.description
Real-time tracking endpoint including URL, protocol, and data schema reference

# properties.driverRef.description
Reference to the current driver if changed from the originally assigned driver

# properties.updatedAt.description
Timestamp when this trip update was issued

# properties.descriptor.description
Human-readable description of the contract

# properties.fulfillments.description
Fulfillments associated with this contract