{
  "resourceType": "MessageHeader",
  "id": "1cbdfb97-5859-48a4-8301-d54eab818d68",
  "eventCoding": {
    "system": "http://example.org/fhir/message-events",
    "code": "admin-notify"
  },
  "destination": [
    {
      "name": "Acme Message Gateway",
      "target": {
        "reference": "Device/example"
      },
      "endpoint": "llp:10.11.12.14:5432",
      "receiver": {
        "reference": "http://acme.com/ehr/fhir/Practitioner/2323-33-4"
      }
    }
  ],
  "sender": {
    "reference": "Organization/1"
  },
  "enterer": {
    "reference": "Practitioner/example"
  },
  "author": {
    "reference": "Practitioner/example"
  },
  "source": {
    "name": "Acme Central Patient Registry",
    "software": "FooBar Patient Manager",
    "version": "3.1.45.AABB",
    "contact": {
      "system": "phone",
      "value": "+1 (555) 123 4567"
    },
    "endpoint": "llp:10.11.12.13:5432"
  },
  "reason": {
    "coding": [
      {
        "system": "http://terminology.hl7.org/CodeSystem/message-reasons-encounter",
        "code": "admit"
      }
    ]
  },
  "response": {
    "identifier": "5015fe84-8e76-4526-89d8-44b322e8d4fb",
    "code": "ok"
  },
  "focus": [
    {
      "reference": "Patient/example"
    }
  ],
  "definition": "http:////acme.com/ehr/fhir/messagedefinition/patientrequest",
  "meta": {
    "tag": [
      {
        "system": "http://terminology.hl7.org/CodeSystem/v3-ActReason",
        "code": "HTEST",
        "display": "test health data"
      }
    ]
  }
}