Only a few pieces of additional data are necessary to uniquely identify a credit card user from credit card data. (sciencemag.org)
Are you the kind of credit card user who wants to sit back and wait for their rewards to accumulate, and then easily redeem them? (wisebread.com)
So do debit card users who forget pin numbers or otherwise can not make the machine work (this includes the credit option; the stylus does not work much of the time). (thecollegeinvestor.com)