I tried to do this several years ago when checking in at FW on a Saturday. I had two reservations in my name (we had a huge family gathering there and I had a couple of campsites and 3 homes). Anyway, they charged my first reservation to my debit card no problem, but the second (and larger one) was declined. The person helping mentioned something about only being able to take or charge a certain amount of $$ on the debit card on the weekend. I knew there was a limit on ATM withdrawals, but not on spending. Luckily I had my checkbook with me and wrote a check for the second reservation.