public interface DoInventory
DoPaymentCmdImplementation class implements the
DoInventoryinterface to indicate to the OrderProcess Controller command that it should let the
DoPaymentCmdImplementation class handle the Updating of Inevntory (by calling the UpdateInventory Task Command) directly.
For DoPaymentCmd implementations that do not implement the
the OrderProcess Controller command calls the UpdateInventory Task Command before calling
the DoPayment Task Command.
DoInventory interface declares no methods.