# Wellhub > Wellhub (formerly Gympass) is a corporate wellbeing platform that gives employees access to fitness, mindfulness, therapy, nutrition, and sleep partners through their employer. Its public developer surface is the Integrations API, which lets client HR/payroll systems sync employee eligibility to Wellhub in real time. ## APIs - [Integrations (Eligibility Management) API](https://developer-hub.wellhub.com/docs/integrations/api/): OAuth2 client-credentials REST API to create, submit, and track batch eligibility jobs. Production https://api.clients.wellhub.com, Sandbox https://pilot-api.clients.wellhub.com ## Specs - [OpenAPI 3.0.3 spec](https://developer-hub.wellhub.com/openapi/eligibility-spec.json): 10 operations across OAuth, Companies, Employees, and Jobs ## Docs - [Developer Hub](https://developer-hub.wellhub.com/docs/integrations/api/) - [Getting Started with the REST API](https://developer-hub.wellhub.com/docs/integrations/api/getting-started/) - [Eligibility via REST API](https://developer-hub.wellhub.com/docs/integrations/api/eligibility/) - [OpenAPI Specification page](https://developer-hub.wellhub.com/docs/integrations/api/openapi/) - [Developers portal](https://developers.wellhub.com/) - [Trust / Security center](https://security.wellhub.com/) ## Conventions - Auth: OAuth 2.0 client credentials; POST /oauth/token (form-encoded) returns a Bearer JWT - Pagination: opaque `cursor` query param; last page when `cursor` is null - Rate limits: per client, RPM + burst/s per endpoint; 429 with RateLimit-Limit/Remaining/Reset headers - Errors: JSON `{ error, trace_id }`; validation failures list `{ field, message }` - Compliance: ISO 27001, PCI DSS, GDPR ## Repo artifacts - [Authentication](https://raw.githubusercontent.com/api-evangelist/wellhub/refs/heads/main/authentication/wellhub-authentication.yml) - [Conventions](https://raw.githubusercontent.com/api-evangelist/wellhub/refs/heads/main/conventions/wellhub-conventions.yml) - [Error catalog](https://raw.githubusercontent.com/api-evangelist/wellhub/refs/heads/main/errors/wellhub-problem-types.yml) - [Rate limits](https://raw.githubusercontent.com/api-evangelist/wellhub/refs/heads/main/rate-limits/wellhub-rate-limits.yml) - [Agent skill: sync eligibility](https://raw.githubusercontent.com/api-evangelist/wellhub/refs/heads/main/skills/wellhub-sync-eligibility.md)