API registry / RUN Powered by ADP

RUN Powered by ADP

Gated behind ADP partner login. ADP API Explorer (RUN): https://developers.adp.com/ (JS-rendered developer portal. API guides (e.g. Payroll Data Input API Guide PDF at marketplace-cdn.adp.com) and Postman collections are behind ADP Marketplace partner login; production also needs per-client mTLS certificates. No public spec found.)