Your experience and what you were discussing are two issues entirely. Equating the two is a misunderstanding of the problem. Presenting a list of cards and th

Your experience and what you were discussing are two issues entirely. Equating the two is a misunderstanding of the problem. Presenting a list of cards and throwing errors based on the select list are two things. > I did see higher than anticipated abandonment rates after wrong CC numbers/types were chosen. No. You didn't. What you saw was a higher than anticipated rate of abandonment after a user was presented with an error or told they'd entered an invalid number. > So... unless a client wants to pay for A/B testing That's true. But even still, you opinion is still heavily biased. As someone mentioned, presenting the options via some mechanism (whether that be a select, or a list of images or something like it) doesn't necessitate throwing an error. PayPal, has mentioned, handles this gracefully.