Root Type for Webhook-Event

{
    "contacts": [
        {
            "profile": {
                "name": "Kerry Fisher"
            },
            "wa_id": "16315551234"
        }
    ],
    "messages": [
        {
            "from": "16315551234",
            "id": "ABGGFlA5FpafAgo6tHcNmNjXmuSf",
            "text": {
                "body": "Hello this is an answer"
            },
            "timestamp": "1518694235",
            "type": "text"
        }
    ]
}