How can we filter out those "Paid invoices" from the regular invoices so that customers who set up for auto fax or email only receive unpaid invoices. Certain customers provide us with their credit card numbers on file and they would ask us to use that to pay certain orders at the time of invoicing. Because the system can't recognize which invoices are not supposed to be sent through fax or email, all newly completed invoices will be automatically sent to the fax or email queue for further processing. This create a problem when the customer receive the invoice and doesn't realize it's been paid so they pay them again and we have been receiving quite a few complains on that.
Any suggestions?

Thanks, Kitty