Payments may be made by credit card or pursuant to a registered account which requires prior registration and approval as noted on the payment page. Invoices will be sent to the billing address on file for the registered account and payment is due thirty (30) days from the invoice date. The amount of any payment not received by Seller within thirty (30) days of the invoice date shall bear interest at the rate of one and one-half percent (1 1/2 %) per month, retroactive to invoice date. Credit cards are charged at the point of shipment for payments made by credit card.