I need a purchase order number / PO number on my invoice.

You can enter a purchase order number during checkout. Look for the Purchase Order Number field under the Billing Information.

Can I pay by check?

Yes! Simply choose the Check / Pay Later / Guarantee payment method in the checkout process. 

You are not completely registered until we receive your payment.

I need an invoice that is marked "Paid" or need other information on it.

We'll be happy to provide that. Complete the registration process first and then contact us with what you need for paperwork.