We are now accepting both Credit Card & ACH payments. We are now also accepting Purchase Orders (POs). POs must be sent to us in PDF format via eMail. The will be no separate Invoice issued. ACH payments to corresponding POs must be received by Two (2) Calendar Months (60 Days min.) before the 1st Day of Class or One (1) Calendar Month (30 Days min.) after the original PO issue date, whichever comes first.