Business Rules for Cafeteria Ordering System (partial)

Rule Definition
Delivery time windows are 15 minutes, beginning on each quarter hour.
Deliveries must be completed between 10:00am and 2:00pm local time.
All meals in a single order must be delivered to the same location.
All meals in a single order must be paid for using the same payment method.
Meals must be ordered within 14 calendar days of the meal date.
If an order is to be delivered, the patron must pay by payroll deduction.
Order price is calculated as the sum of each food item price times the quantity of that food item ordered, plus applicable sales tax, plus a delivery charge if a meal is delivered outside the free delivery zone.