You can pay your Constellation Design invoice online via PayPal or via Google Checkout. GreenZap is no longer accepted due to instability with the GreenZap service.
With PayPal you may use funds from your credit card, your bank account, or an existing PayPal account. You do not need to have or open a PayPal account to use this service. Click on the PayPal button below, type your invoice number in the “Item” field, fill in the amount of your invoice as the “unit price,” and proceed with or without logging in to an existing PayPal account.
Google Checkout requires an intermediary e-mail stage of the process for things not having a set value per unit, and since invoices are rarely identical, that's the method available here. Send an e-mail requesting payment via Google Checkout and you'll receive a reply message with payment details within 24 hours.
Invoices are due upon receipt. Invoices unpaid after thirty days are subject to a late fee of ten percent (not to exceed $100.00). Payment via regular installments may be arranged to avoid late charges.