Just want to maintain a .pdf of the invoice as sent for basic record-keeping and to be able duplicate if needed in the future.  Also noticed that printing/previewing an invoice after it's been paid, which results in the "PAID" stamp and zero balance due shown on the invoice, doesn't indicate how the invoice was paid, e.g., "by bank transfer on date," or, "by mobile deposit on date."  This info would be of greater value to me (and potentially clients that request a copy and/or confirmation of payment) than the superfluous stamp.