We would like to be able to convert an invoice into a Paid in Full receipt. We have a template design for this but when we sent it to our customer it still shows as an invoice and there are times they don't open the invoice to see it's paid in full. It causes them confusion and makes them think they are being charged again. If we could convert the invoice to a receipt, 1) the file would show receipt, and 2) there could be a separate email to auto-send with the receipt that shows receipt instead of invoice