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The flip doesn't appear to be working on Linux/Chrome. It mirrors the front side, but whatever's supposed to show up on the back never does.

Actually this was at work, where I have a version of chrome that's 6 months to a year old. Linux / most recent Chrome seem to work better.

You should try out the mastercard one, that one has te CCV on the back. Some others have it on the front.

EDIT: And fill out the entire front.

I didn't realize it either, there was no indication that my expiration date wasn't valid.

By the way on the Mastercard on Chrome 28 on Win 7 it shows the CVC on the top left corner of the card so that the text overlaps with the border. On my Mastercard atleast the CVC is in the middle of the card.

If you fill in valid data for everything on the front, a "flip the card" button appears.