FHIR Subscription represents the HL7 FHIR R4 Subscription resource within the myHealth FHIR Metadata Catalogue Solutions in MyHealth@MyHands. The FHIR Subscription resource defines the parameters for real-time clinical event notifications specifying the triggering event type, patient/practitioner filter criteria, notification channel type, and payload format. It supports event-driven interoperability by enabling systems to receive push notifications when specific clinical events occur, rather than requiring repeated polling. FHIR Subscription realises the Maccess.exchange sub-domain for exchange protocol metadata.