Watch the debit card "float"!! There are some banks that are now processing "non signature credit" transactions as a debit transaction....
The way is looks to you and I the debit is still "pending" as with any other checkcard purchase but if it is a non signature item the freeze the funds the minute you do the transaction.
Here is what happened to me:
I had 4 "pending" checkcard purcahses on the 11th leaving a very small available balance. The night of the 11th I had to pay my power bill by 5 and I was getting paid on Tuesday. I called the power company and paid using my chckcard as a "credit card" knowing that the float would cause the item to hard post on Tuesday night and be covered by my pay deposit.
Monday I looked at my account and as I expected the pending items from Friday had cleared with no problem and my account was a negative 89.00 from the "pending" utility payment. On Tuesday the item was still pending but my account had 4 $35 overdraft charges from the 11th. Even though the pending items (totaling 21.00) had hard posted with no problem. When I called the bank I was told that the "non signature credit" transaction that I did on Friday evening was debited from my "hard" balance and becuase the bank posts largest to smallest items the power payment caused the 4 smaller "previously processed" debits to be insufficient.
I was told there would be no refund as this was not a bank error.