Combining class objects into json

Question

Hi I have the following classes.

As you can see there is a Body portion and I have created a json based off of this, however my question is:

Suppose we ignore the Body portion of this, and we just focus on Payment, Items, and Receipt...is there a way to programatically on the fly create a json based off of these three classes? Pretend the Body class is non-existent.

What would something like this look like?

public class Payment
        {
            public string Amount { get; set; }
        }

        public class Receipt
        {
            public string Info { get; set; }
            public string Amount { get; set; }
        }

        public class Items
        {
            public string SKU {get; set;}
        }


        public class Body
        {
            public List<Item> Items { get; set; }
            public List<Payment> Payments { get; set; }
            public Receipt Receipt { get; set; }
        }

I have the json.net dll referenced I'm trying to figure out what I can do to get the three classes into a new class if hypothetically the Body class wasn't there and I had to make it on the fly.

Receipt test = new Receipt();

string DataJson = JsonConvert.SerializeObject(test, Newtonsoft.Json.Formatting.Indented, new JsonSerializerSettings { NullValueHandling = NullValueHandling.Ignore });

I can get the json individually like this however I want one json and formatted since the Items is a List as well as Payment, hopefully this makes sense.