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?
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When you run a credit card you receive an auth code. Once the credit card machine is batched they are sent to be finalized.
Restaurants have their own SIC code with the government and depending on that code their credit card processor allows certain configurations for the machine that is built for restaurants (such as allowing tips)
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