Hello, i used Subway gift card , here is wath i do ..... go to buy credits ,there a page will open ,. there is a place there for gift cards, find the one on there and enter the number on the card ,i have no probleme doing it that way ...Hope this helps you , maybee someone with a better way of explaining will had to this Thread , and your question. Frapp (write the amount, first ,then go to gift cards on the page :)