Half a croissant, on a plate, with a sign in front of it saying '50c'
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Reverse credit card

Change your balance to a credit
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Imagine a credit card true to form: swipe it and it changes your account balance to a credit. $842 becomes -$842. Ought to be as simple as a couple lines of code.
whatrock, Dec 17 2015


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Annotation:







       If this is an idea where one can pay one's credit-card bill at a shop (and the merchanter gets a credit service-fee instead of a debit), then that's a wonderful idea.
FlyingToaster, Dec 18 2015
  

       What if you accidentally swipe twice?
pocmloc, Dec 18 2015
  

       but how?
hippo, Dec 18 2015
  


 

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