Use case 4

###Title Checkout ###Precondition

• Customer must have been ordered something;

###Primary Actor Waiter

###Main Success Scenario After finishing up with the order, waiter presses "Checkout" for proceeding to payment process. Beforehand, system asks to register any discount card. Waiter registers discount card if available. Total amount is shown and will be proceeded to payment.

###Extensions

• Discount card is not valid;