How do I add more funds to my credit/deposit account?

OverDrive Marketplace users with ‘Purchase’ permissions can purchase content credit from the Shop tab drop-down menu. We will issue an invoice within approximately 2-4 business days. The credit is added to your account as soon as you are invoiced and payment is required within 30 days. Credits purchased beyond your contractual content credit can be used for all types of invoices, upon request.