During the checkout process, you can enter a credit card or purchase order (PO) number as payment. If you choose to pay by credit card, Addgene will charge your card after your order ships. If you choose to pay by purchase order, Addgene will issue an invoice to the billing address that you provide during checkout. This invoice can be paid by credit card, check, or bank transfer (non-US customers only). Payment terms are net 30 days from the invoice date.