[dools]

The field formatting stuff is great, but I think the interface to fill in the data on the card is monumentally confusing.

I do, however, like the idea of offering a "live preview" of data filled in via a normal credit card form (using the stripe checkout library for example which does all the nice card type detection and input formatting stuff for you).

This type of "preview" could also be useful in a confirmation step, ie. show the front and back of the card so the user can confirm it looks okay (I don't think there would be much advantage in "flipping" back and forth between front and back, though).