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Its broken for American Express cards. Amex cards don't do the number as 4 groups of 4, and the security code is on the front.

EDIT: I apologize it works! (note I did try it but apparently mis-typed my first four digits ....)



It worked fine for me on my Amex tests. 4-digit security code showed up in the right place, numbers were grouped correctly.


Did you try it? It gets the 4+6+5 and CVC on the front just right!




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