Initially, they refused to rent the car.

They recommended I buy full insurance, but since I had already purchased full insurance on Zuzuche, I didn't buy it. However, I needed to provide a deposit of over 900 euros. I tried three different foreign currency cards (magstripe), but none of them worked. They required a foreign currency card with a chip in my name; other people's cards wouldn't work, even though one of my companions had a chipped card. The staff said if I paid 50 euros (for 2 days) for their full insurance, they would waive the deposit requirement. Reluctantly, I paid the 50 euros. The same issue with magstripe cards happened again at the car rental company at Athens airport (a different company). This time, we used my companion's card to pay the deposit and successfully picked up the car.