The easiest way would be for you to move your BillFlash direct under us. Then we can work directly with you to figure this out. We will need you to setup autopay and then invoices will come from Walker Tek instead of BillFlash or Next Trust. We'll charge the same price that you should be getting direct from BillFlash. You may then cancel your old account with BillFlash when you are done with it to get any unpaid postage back. Private message me if you want to do this.
Walker Tek Solutions, LLC