The API Platform domain provides the centralized API infrastructure for internal and external consumers. APIs are deployed via Amazon API Gateway and follow RESTful design patterns.

Scope

• Internal service-to-service APIs
• External partner and provider APIs
• CMS-mandated FHIR APIs (Patient Access, Provider Directory, Payer-to-Payer)
• API lifecycle management, versioning, and governance

Compliance

CMS-0057-F mandates FHIR R4 APIs for payer-to-payer data exchange by January 1, 2027. This domain owns the API Gateway infrastructure supporting those endpoints.