Get all webhook endpoints

{
    "data": [
        {
            "id": "stringstringstr",
            "url": "http://example.com",
            "events": [
                "receiver.new"
            ],
            "last_event_at": "string",
            "instance_id": "stringstringstr",
            "created_at": "2019-08-24T14:15:22.123Z",
            "updated_at": "2019-08-24T14:15:22.123Z"
        }
    ]
}