using System;

using System.Collections.Generic;

using Newtonsoft.Json;

using Newtonsoft.Json.Converters;

public class Program

{

    public static void Main()

    {

        var amount = new Amount()

        {

            RequestedAmount = 12.0m

        };

        var json = Serialize(amount);

        Console.WriteLine(json);

    }

​

    static string Serialize(Amount amount)

    {

        var settings = new JsonSerializerSettings

        {

            Converters = new List<JsonConverter> 

            { 

                new StringEnumConverter(),

                new IsoDateTimeConverter() { DateTimeFormat = "yyyy-MM-dd" } 

            },

            DefaultValueHandling = DefaultValueHandling.Ignore

        };

        var json = JsonConvert.SerializeObject(amount, settings);

        return json;

    }

}

​

class Amount

{

    [System.Xml.Serialization.XmlAttributeAttribute()]

    public decimal RequestedAmount;

​

    [System.Xml.Serialization.XmlAttributeAttribute()]

    public decimal CashBackAmount;

​

    [System.Xml.Serialization.XmlAttributeAttribute()]

    public decimal TipAmount;

}

​

​