#### example:notify-update-appointment (cancel)
```
{
    "last_updated": "2019-04-01 09:44:29pm",
    "resourceType": "Bundle",
    "type": "message",
    "entry": [
        {
            "resource": {
                "resourceType": "MessageHeader",
                "eventCoding": {
                    "code": "notify-update-appointment",
                    "display": "Notify Update Appointment"
                },
                "destination": [
                    {
                        "endpoint": "https://sandbox.caredove.com/api/native_v1/last_payload_fhir4"
                    }
                ],
                "focus": [
                    {
                        "identifier": {
                            "type": {
                                "text": "Caredove Inc."
                            },
                            "system": "https://caredove.com/fhir/NamingSystem/id-referral",
                            "value": "94jd7597-d19a-41c2-bb9a-3077s53bd9ae"
                        }
                    }
                ]
            },
            "request": {
                "url": "MessageHeader"
            }
        },
        {
            "fullUrl": "5856529070",
            "resource": {
                "resourceType": "Appointment",
                "id": "5856529070",
                "status": "cancelled",
                "basedOn": [
                    {
                        "reference": "ServiceRequest/5856529070"
                    }
                ],
                "participant": [
                    {
                        "status": "declined"
                    }
                ]
            },
            "request": {
                "url": "Appointment"
            }
        }
    ]
}