Bluefly takes only credit cards?

if your debit card has a visa/mastercard logo then it can be used as a credit card. the amount will just be debited from whatever account it's hooked up to.

just like in a store... they'll sometimes ask you "debit or credit?" and you can use your debit card but say credit and then you won't have to use your pin number. some machines somehow automatically know it's a debit or credit tho (not sure how)