system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: when does the tip get charged from your debit/credit card at restaurants if they swipe it before you add tip?

At restaurants, they charge your debit/credit card before the tip is added. When does the tip get charged from your card?
gpt
The resturant staff will, at the end of the night or other low-volume time, enter in tips from reciepts into their computers.   As the credit card transaction has not been finalized yet, it still can be modified to include a tip.