If you had been using QuickBooks for your billing solution and converted to ChamberMaster Billing, you may have open invoices in QuickBooks.

When you create a payment in ChamberMaster Billing, it will be entered as a journal entry in QuickBooks once you post the Journal Entry export. It will reduce the customer’s balance but does not tie to the invoice originally created in QBs. To mark that payment as paid:

Go to that customer in QBs
Open the invoice
Click the button to apply a credit
The Journal entry will appear and you can apply that to the invoice.

This should only be necessary for invoices that were open before you started creating them in ChamberMaster Billing.