IME, all you "know" is that they entered the number and forgot to pick the proper corresponding card type. The requirement to select a card type always seems w

IME, all you "know" is that they entered the number and forgot to pick the proper corresponding card type. The requirement to select a card type always seems wrong to me. When you swipe a card at a terminal, you don't have to tell it if you're swiping an AmEx or a Visa. It can tell JUST from the number.