How do restaurants charge your card for the tip if they already ran your card and gave it back to you before giving you the receipt you wrote the tip on?
In: 169
They have your credit card number from when you gave it to them to pay the bill. That’s all they need to charge your card. Probably they wait until asking for the tip to charge you the entire amount, but there’s little (except laws) stopping them from charging you at any time after as long as they know your credit card number
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