TELUS Health CHR Enterprise API
The TELUS Health Collaborative Health Record (CHR) Enterprise API is a GraphQL interface onto the CHR ambulatory-care platform used by Canadian clinics and allied health professionals. Its published introspection document describes 505 types, 64 root queries and 49 mutations spanning patients, appointments and availability, encounters, referrals, cases, tasks, group visits, attachments, letters, lab results (including OLIS lab messages), allergy and medication records, health profiles, facilities, providers and work hours. Pagination follows the GraphQL Cursor Connections specification (default 50, maximum 100 records per page). Authentication is unusual and notably strong: the consumer generates a 2048-bit RSA key pair, registers the public key on an API Consumer inside the CHR account, and signs its own RS512 JWT that must carry a matching iss claim and expire within 900 seconds — there is no authorization server, no token endpoint and no client secret. A companion Event Notification Service pushes 21 signed webhook topics carrying identifiers only, with no personal or personal-health information in the payload. Every API action is audit-logged for 90 days. The API ships on a bi-weekly release train with a dated public changelog going back to 2022, but it is a paid feature available to select customers, and the executable endpoint is issued per clinic account rather than published.