Gets or sets the last name of customer.
This Attribute is marked as optional, but it is required if Direct is chosen as BookingType and the customer isn't already created in the database or its ID is unknown. This is usually the case when changing a Reservation with BookingType Direct from outside the sunnycars-Network.
EditReservationRequest Class | SunnyCars.Schema.Osi.WsReservation.V4 Namespace