In Calibre you must give the credit card you signed up with. It's what BN used to make the drm for your books. The card can be canceled etc just needs to be the one you started with.
Does this mean that if you're just signing up now and you use a pre-paid CC with just a few dollars on it that that would be the CC # you always use or would it change the next time you buy something and use a different CC?
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