Overdrive distinguishes between "Discovery" and "Circulation" APIs.
To quote the glossary: Discovery APIs: Discovery APIs are designed to allow your users to browse and explore OverDrive digital collections. You can search for titles, check availability, and get details on specific titles. Circulation APIs: These APIs are designed to allow you to circulate content from an OverDrive digital collection. You can borrow and place holds on titles, see what a specific user has borrowed or placed on hold, and get download links for content that a user has borrowed.
Library Simplified uses the Discovery APIs to keep track of the items in your Overdrive collection, and the Circulation APIs to conduct transactions on behalf of your patrons. Library Simplified needs access to both. |