You can easily add an additional charge on a Booking by following the steps below
Login to your ChargeAutomation account here chargeautomation.com
Go to the Bookings Page
On the specific booking you want to add an additional charge, click on the Drop down icon
Click on the tile with the + icon
Enter the amount, description and whether you would like to charge now or send it as a Payment request (P.S. you can only send as a payment request if the Booking has an email attached to it)
You can enable Chargeback Protection by checking the box in the image below
