What Is HR API Integration? Employee, Org and Payroll Data Across HR Systems

HR API integration connects software to HRIS, directory, payroll, and related systems to programmatically access workforce information such as employee profiles, organizational structures, employment status, time off, benefits, and payroll records. The guide describes Unified.to’s HR & Directory API as a normalized interface spanning 695 integrations, including Workday, ADP, BambooHR, Rippling, Okta, and Microsoft Entra ID, using request-time reads rather than storing replicated employee records. It distinguishes HR APIs from SCIM, presenting SCIM as focused on downstream account provisioning while HR APIs provide broader workforce data for directories, onboarding and offboarding, identity management, analytics, payroll features, and AI automation. It also covers native and polling-based webhook events, authentication management, security controls, varying vendor support for objects and write operations, and limitations such as incomplete source data and the absence of inferred business logic. The guide recommends building integrations internally when supporting only a small number of essential HR systems, while suggesting a unified API for products that must support many systems and avoid maintaining separate authentication, polling, reconciliation, and compliance processes.

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