You can only adjust tips for credit card sales before the batch is settled. The tip cannot be adjusted if the transaction was completed through a EMV reader.
Note: You can adjust the tip from another device if the shift that the transaction was performed in has been closed. You can adjust the tip if the shift is open ONLY if adjusting the tip from the same device where the transaction was performed.
Adjusting tips for a completed credit card sale
Tap on the appropriate ticket from the Completed tickets area of the screen.
Too many tickets? Tap My tickets to view just your completed tickets or enter the ticket number or customer's name in the search bar.
Tap Adjust Tip.
Enter the corrected tip amount and tap Done.