the green dot cards that you get from walmart say "Debit" right on the card... when you use it through Attitude & Sage Pay don't use it as a debit card.... use it as a credit card and it will work just fine. I used a green dot card for the order i placed last week and i just got my seeds yesterday in the mail.Thanks Weevie, green dot in fact is the one I thought WOULDN'T work, but I haven't done any research yet so I guess I cant say for sure if they don't, I've just had problems with them in the past.