Consider the person who rents a car and checks into a hotel with a credit card. The car rental and hotel company may request authentication that there is credit enough for an accident, or profligate spending on room service. Thus a card may later be refused when trying to purchase an activity such as a balloon trip. Though there is adequate credit to pay for the rental, the hotel, and the balloon trip, there is an insufficient amount to also cover the authorizations. The actual charges are authorized after leaving the hotel and returning the car, which may be too late for the balloon trip.