webhook schema

{
    "event": "guest_booked",
    "createdAt": "2019-08-24T10:02:02.000Z",
    "object": {
        "uid": "string",
        "eventTypeUid": "string",
        "status": "open",
        "timeZone": "Asia/Tokyo",
        "createdAt": "2019-08-24T10:01:01.000Z",
        "updatedAt": "2019-08-24T10:02:02.000Z",
        "startedAt": "2019-08-24T14:00:00.000Z",
        "endedAt": "2019-08-24T15:00:00.000Z",
        "cancelReason": "Another meeting scheduled",
        "cancelledAt": "2019-08-294T14:01:01.000Z",
        "cancelledBy": "guest",
        "contact": {
            "email": "example@example.com",
            "name": "Taro Yamada"
        },
        "answers": [
            {
                "question": "How did you find out?",
                "content": [
                    "SNS"
                ]
            }
        ],
        "tracking": {
            "utm_campaign": "winter_campaign",
            "utm_source": "twitter",
            "utm_medium": "owned_media",
            "utm_content": "jicoo-how-to",
            "utm_term": "howto"
        }
    }
}