system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do restaurants, pubs, etc. process credit/debit card "tips".

Example: I'm in a restaurant. The bill arrives. I give them my credit card. Card comes back. I calculate and include my tip and the total on the check/receipt. 

But I have never noticed a debit of the tip amount on my statements. How do they actually receive the tip amount?
gpt
When you give them your card, they put a temporary authorization on it to verify that the card is valid and has funds available.

After you've filled in your tip amount, they simply bill you for the total (price plus tip), which is what shows up on your statement.