is used for questions related to payment cards.

- Stackoverflow.com Wiki
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Paying for something online with a credit card is simple, right? Yes and no. Yes, because we’ve been doing it since the early days of the Internet (e.g. Amazon), and no, because no two credit card forms are alike.


Typing a 15-16 long string of numbers without a single error can be challenging for most users – yet, it’s what all users have to do during the checkout flow as they reach the ‘Credit Card Number’ form field.


Ninety percent of Americans have used a credit card, but far fewer understand the underlying systems enabling their payments. So let’s dive in to see what happens when you swipe your card!