When you arrive at the Thrifty car hire branch at the airport in Palma de Mallorca to collect your car, you'll need to show a current valid driver's licence that you've had for at least one year. The island is subject to Spanish driving laws, which don't require you to get an International Driving Permit. You'll also need to show your passport and have a credit card to cover the pre-authorisation of the total cost. If you've pre-booked, this must be the same card that you used.