Do I have to secure a credit card for a reservation? A "Guaranteed Reservation" may be required for specialty vehicle reservations, such as minivan, SUV, and \ convertible car classes. If a guaranteed reservation is required for your trip, credit card information will be secured. The following credit cards are accepted for Guaranteed Reservations: American Express, Discover, MasterCard, and Visa. Cancellations are accepted up to one calendar day before reservation date.