Contentstack Fetch Entry JSON

ContentstackClient stack = new ContentstackClient(new ContentstackOptions()
{
    ApiKey = "blt94519f01d8f92c86",
    AccessToken = "cs99af6674ef2a7a53770da6b7",
    Environment = "contentdelivery",
});
Entry entry = stack.ContentType("fieldtypes").Entry("blt63b6985324826b78").Fetch<Entry>().GetAwaiter().GetResult();
Console.WriteLine(entry.ToJson());