JEN cannot issue invoices until you have completed an order for membership. Under the JOIN button, select the membership level you wish to join under, and complete the membership application. When you are prompted to choose between "Use a Credit Card" and "Send a Check", select the Send a Check option. Once you complete your order by clicking SUBMIT, you will receive an invoice immediately by email to the address you used to complete your order. You can then use that invoice to process your school purchase order.