ADP Workforce Now API
Workforce Now has REST APIs on the ADP Developer Portal, gated behind the paid API Central add-on (Marketplace SKU 410612) that each customer must buy. Auth is OAuth 2.0 over mTLS with ADP-issued certificates, and every client instance needs separate credentialing and consent setup.
Frequently asked questions
ADP Workforce Now scores A+ on the API Report Card. Workforce Now has REST APIs on the ADP Developer Portal, gated behind the paid API Central add-on (Marketplace SKU 410612) that each customer must buy. Auth is OAuth 2.0 over mTLS with ADP-issued certificates, and every client instance needs separate credentialing and consent setup.
ADP Workforce Now has a workable official integration path. Most engineering teams can build against it directly. Open API: self-serve, documented, with SDKs
ADP Workforce Now is Automatic Data Processing's flagship cloud Human Capital Management (HCM) suite for mid-sized employers, unifying payroll, tax filing, HR administration, benefits administration, time and attendance, talent acquisition, performance, learning, compensation, and analytics into a single platform.
Vertical: Enterprise HR / ERP (specifically mid-market HCM / payroll). Running scheduled and off-cycle payroll with federal, state, and local tax calculation, filing, and W-2/1099 generation. Direct deposit, paycards (Wisely), garnishments, and same-day pay (Earned Wage Access).
10/10 within U.S. mid-market HCM/payroll. ADP pays roughly 1 in 6 U.S. workers, has ~1.1M total clients, and Workforce Now alone is reported to serve well over 100,000 mid-market employers.
Yes - ADP Workforce Now is the canonical system of record for payroll, tax, benefits, and workforce data at tens of thousands of mid-market U.S. employers.
~15+ years as 'Workforce Now' (ADP itself founded 1949).
ADP API Central is a separately-purchased paid product with per-employee monthly fees on the ADP invoice - integration is not free or self-serve. Per-customer provisioning is 'the biggest onboarding bottleneck' for multi-tenant SaaS vendors - every client must independently buy API Central and complete credentialing. Full sourced list under Sources below.
Common alternatives include Paychex Flex, Paycom, Paylocity, Workday HCM, UKG Pro / UKG Ready, Paycor. Graded alternatives appear under "More from the report card" below.
Grades measure one thing: can a customer's engineering team get their own data out programmatically? We check six things (whether a real API exists, how access is gated, data coverage, auth quality, docs and developer experience, and stability) and roll them into a letter grade. Grades get re-verified, and they only move on evidence.