API registry / Zoho People
Zoho People
No machine-readable spec. Zoho People API docs: https://www.zoho.com/people/api/overview.html (HTML docs only. Zoho publishes OpenAPI for CRM (zoho/crm-oas) and Books, but nothing for People. Data-centre-specific host https://people.zoho.{dc}/people/api/.)
Zoho People publishes no machine-readable API spec.