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How Credit Card Numbers Work?

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How credit card numbers work? It is interesting to see how quickly payment gateway web page can check whether given card number is valid. There is a pattern that every card number adheres to. Such patterns can be matched using JavaScript. A credit card number is made-up of four different components: MII (digit 1), IIN (digits 1-6), IAI (digits 7-15) and a check digit (last digit). Let’s see...

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