There’s two ways to mark something as paid. First, from the details of an appraisal. Second, from the analytics. Currently, the only way to reverse the payment is from the details of an appraisal.
In the Fees & Costs section on the right, you can mark your appraisal fee as ‘paid’.
If this was a mistake, simply click on the “Paid On” Date, then click “Clear Date”. This will clear out the date set for payment and set the fee back to unpaid. See screenshot below.