When paying at the pump, insert your card and follow the instructions. If the transaction can’t be completed, you may need to go inside and pay the attendant prior to filling your tank.
When tipping with your Visa gift card, the merchant or issuer may decide to authorize your transaction for an additional 20% above your total bill. The actual tip amount is your choice.
Some car rental companies and hotels may require a credit card to make a reservation. At check-in, these merchants may put a "hold" on the estimated amount of your reservation, making those funds unavailable for a period of time.