Workday, ADP, and Rippling API documentation: A partner-side comparison (May 2026)

Building integrations with Workday, ADP, and Rippling APIs presents distinct challenges due to their varied approaches to developer experiences and documentation quality. Workday requires familiarity with its object model and often gates documentation behind logins, complicating the setup process with bi-annual release cycles that necessitate extensive regression testing. ADP, while offering a mature developer portal, scatters its documentation across different product lines, forcing developers to navigate multiple silos. Conversely, Rippling provides a more straightforward approach with token-based authentication and seeded sandboxes, allowing for quicker initial setup, though it lacks comprehensive edge case documentation. These differences impact not only the speed of integration but also the ongoing maintenance costs for partners, as they often need to implement custom solutions to accommodate varying data models and authentication protocols across the platforms. Fern addresses these challenges by providing a unified API specification that generates consistent SDKs and documentation, reducing integration time and maintenance overhead for partners.