15 minFHIR API Explained: How EHR Integration Works (Epic, Oracle Health, HL7 v2)What a FHIR API is, how SMART on FHIR authorization works, how HL7 v2 messages (ADT, ORU, SIU) and interface engines like Mirth Connect fit in, and what an EHR integration project actually involves, with a worked Patient and Observation example.