Add additional information about new products in with your invoice. Print “PLEASE FORWARD THIS NOTICE TO PURCHASING”. Take the opportunity to discuss sales going on, discount prices on certain goods, a new location you have opened, new operating hours started, an updated list of all the product lines you offer (maybe some are new he did not know you carried). Include these periodically in with the invoice and most of the time, AP clerks will forward information sent by the vendor and addressed to the buyer.