Normally, when the client pays an invoice through a Pay Now link, the OfficeTools database is updated automatically. In the rare case that this does not happen, the OfficeTools database can be updated with the payment information manually.
To update Pay Now status manually, select Billing > Invoices. Highlight the invoice and click the APX button and click Update Pay Now Status.
OR right-click the Pay Now invoice and click Update Pay Now status.