ReadonlyactionOptional ReadonlydeliveryOptional Readonlydeliverykey of an existing Delivery.
Either `deliveryId` or `deliveryKey` must be provided.
ReadonlynameName of the Custom Field.
Optional ReadonlyvalueIf value is absent or null, this field will be removed if it exists.
Removing a field that does not exist returns an InvalidOperation error.
If value is provided, it is set for the field defined by name.
idof an existing Delivery.