Podcasts · Dad, How Does It Work? Science Podcast for Kids
How Does Tapping a Credit Card Actually Pay? for Kids
· 5:04 · S1 E45
Episode How Does Tapping a Credit Card Actually Pay? for Kids
You tap your credit card on the machine.
Beep. Green check mark. Done.
But... what actually just happened?
No cash moved. The card barely touched anything.
So how did the shop know the payment was okay?
And why can a card sometimes be declined even when there’s money in the account?
That tiny tap is actually sending a permission request through several computers before the beep ever happens.
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