Select on what the payment is calculated.
"One Percent of Balance Due" - will use the 'Balance Due' in the Charges & Payments tab of the booking. "Percent of Charges" - will use the 'Total Charges' in the Charges & Payments tab of the booking"Percent of Price" - will use the value in the 'Price' field in the Charges & Payments tab of the booking. "One Night of Charges" - will use the average price of a night calculated from the sum over all nights.