Final answer:
Pre-payment or prepaid service is when the guest pays before receiving their food.
Step-by-step explanation:
The service where the guest pays before receiving their food is called pre-payment or prepaid service. In this type of service, the guest places an order and pays for it upfront, and then their food is prepared and served to them. This is commonly used in fast food restaurants and cafes where customers pay at the counter before receiving their order.