Root Type for Webhook-System

{
    "body": "+1 (650) 387-5246 added +1 (650) 644-8470",
    "group_id": "16315558032-1530825318",
    "operator": "16503875246",
    "type": "group_user_joined",
    "users": [
        "16506448470"
    ]
}