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I use one specific credit card to narrow the opportunity for fraud due to hacked business databases.(A low limit card, I hope.
)
In that vein, whenever I
must enter a card number, I always check to make sure that it has not been saved on the particular website, sometimes even calling to find out.
Amazon is an offender, so after every transaction I go into my account and re-delete my card. (Can you do that at the App Store?)