When using your card at certain locations, such as
restaurants, hotels, or other venues that often include a
tip or surcharge, merchants may add in a tolerance
amount – a preauthorization of up to 20% or more - so
please ensure you have sufficient funds on the card before you make a purchase.
Example: If your total bill at a restaurant is $50, the card may be preauthorized for $50 + 20%. Although you will only be charged for the actual total that is signed for, you will need an available balance of at least $60 on the card for the transaction to be approved.
If your total, after adding in the tolerance amount, exceeds the balance on the card, it will be declined. Also note that when purchasing gas, many gas stations will not allow prepaid cards to be used at the pump; payments must be made in-store with the cashier.