Navigate to Services
Click Invoices
Under Private Payments, select the invoice ID you want to update
On the order page, locate the Options menu on the right-hand side
Click Mark as Paid

The Options menu also includes additional invoice management actions such as:
Edit & Download Invoice
Send Payment Email
Update date, time or location
Assign Instructor
Edit Notes
Delete Order
Use these tools to manage your private payments and invoices more efficiently.