If the final amount is higher, collect the remaining balance from the client. You can either edit the original booking amount or add a new item to adjust the total due.

If the final amount is lower, issue a partial refund through Booksy. To do this, go to the appointment tile, click the Paid label, and select Refund. Select the Partial refund option, enter the refund amount, select Refund payment, and confirm with Issue refund.