If you want to rent a car from Hertz using your wife's credit card, you'll need to make sure that the card is authorized for car rental purchases. You can do this by calling the customer service number on the back of the card and asking if the card can be used for car rentals. If it is, then you'll need to provide Hertz with your wife's credit card information when you make your reservation. Keep in mind that some cards have restrictions on where they can be used, so it's always best to call ahead and confirm that everything is set up before you arrive at the rental counter.