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Very useful - my citibank credit card used to have a feature like this many years ago (I believe called "virtual card numbers"), but they got rid of it for some reason.

Though I am more likely to give my personal details to citibank than some startup. Trust is a big issue with payment startups.




Citi still has this functionality FYI, just tech that powers it hasn't changed, so stuck with Flash or Windows EXE


Odd. My Citi cards have virtual numbers still.




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