Why does it make you nervous? I was under the impression it was pretty fool proof? See: http://stackoverflow.com/questions/72768/how-do-you-detect-credit-card-t

Why does it make you nervous? I was under the impression it was pretty fool proof? See: http://stackoverflow.com/questions/72768/how-do-you-detect-credit-card-type-based-on-number http://stackoverflow.com/questions/72768/how-do-you-detect-c...