❔ JObject find value

{
    "sale": {
        "id": "x",
        "transaction": {
            "id": "y",
            "state": "Completed"
        }
    }
}

var responseObject = JObject.Parse(responseString);
if (responseObject["sale"] != null && responseObject["sale"]["transaction"] != null && responseObject["sale"]["transaction"]["state"] != null)
{
    if (responseObject.Value<string>("sale.transaction.state") == "Completed")
    {
        Console.WriteLine("Yes");
    }
}