While it is possible, on the website, to pay even with so-called prepaid credit cards (es. Visa Electron), at the time of the pick up of the car it is mandatory to have a valid credit card (with numbers on relief) in the name of the main driver issued by one of the main credit card companies (ex. Visa / American Express / Diners / MasterCard). This is needed as warranty for the rental itself. When the vehicle is rented to you, the renter authorizes (but not cashes) the cautional deposit. This deposit is unblocked at the end of the rental period or, in case of damages or theft of the vehicle, cashed in measure of the amounts stated in the rental agreement.