API registry / CharlieHR
CharlieHR
No public spec. Per CharlieHR's help article (https://help.charliehr.com/en/articles/9579162-integrate-charlie-with-unlisted-platforms), the V3 API documentation is shown only inside the app (Company > Integrations > API Keys) to Super Admins who generate keys; no public developer portal or OpenAPI URL exists.
CharlieHR publishes no machine-readable API spec.