Event(Event)

{
    "app_id": "string",
    "sender": {
        "id": "string"
    },
    "user_id_by_app": "string",
    "recipient": {
        "id": "string"
    },
    "event_name": "string",
    "message": {
        "text": "string",
        "msg_id": "string"
    },
    "timestamp": "string"
}