How do websites know when you input a fake credit card number?
In: Technology
When you pay for something with a credit card, an electronic transaction occurs between the website and your credit card company. The site requests the charge and the company either accepts or declines the purchase. This takes a matter of seconds.
Now if you type a random set of numbers in, you’ll probably get rejected without the transaction even happening. Credit card numbers are not completely random. Different credit card companies follow different patterns of numbers so if you type in random numbers, it won’t likely follow the algorithm and the site will automatically know it CANT be a really number.
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