ACE say this:-
Visa, Mastercard, American Express, Discover, and bank issued debit cards are all accepted at the time of rent. The estimated total price of the rental plus a 250 USD refundable security deposit will be held on the card at pickup. Any unused authorization will be released to the customers bank and from there may take 3 to 5 business days to become available to the customer.
Cash, checks and prepaid cards are not accepted.