using System;

using System.Collections.Generic;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        string json = @"

            {

              ""transaction_id"": 1,

              ""status"": ""Reviewing"",

              ""changelog"": {

                ""2016-Mar-15 10:28 AM"": {

                  ""status"": {

                    ""from"": ""Approved"",

                    ""to"": ""Reviewing""

                  },

                  ""total"": {

                    ""from"": 123.45,

                    ""to"": 246.9

                  },

                  ""shipping_address_1"": {

                    ""from"": ""321 S Main St."",

                    ""to"": ""8355 NW 74th St""

                  },

                  ""shipping_city"": {

                    ""from"": ""New York"",

                    ""to"": ""Medley""

                  },

                  ""shipping_state"": {

                    ""from"": ""NY"",

                    ""to"": ""FL""

                  },

                  ""shipping_postal"": {

                    ""from"": ""10002"",

                    ""to"": ""33166""

                  }

                }

              }

            }";

        TransactionChangeLog changeLog = JsonConvert.DeserializeObject<TransactionChangeLog>(json);

        Console.WriteLine("TransactionId: " + changeLog.TransactionId);

        Console.WriteLine("TransactionStatus: " + changeLog.Status);

        foreach (var dateKvp in changeLog.Changelog)

        {

            Console.WriteLine(dateKvp.Key);  // change date

            foreach (var fieldKvp in dateKvp.Value)

            {

                Console.WriteLine("   changed " + fieldKvp.Key + " from '" + fieldKvp.Value.From + "' to '" + fieldKvp.Value.To + "'");

            }

        }

    }

}

​

public enum TransactionStatus { Reviewing, Approved }

​

public class TransactionChangeLog

{

    [JsonProperty(PropertyName = "transaction_id")]

    public int TransactionId { get; set; }

    [JsonProperty(PropertyName = "status")]

    public TransactionStatus Status { get; set; }

    [JsonProperty(PropertyName = "changelog")]

    public Dictionary<DateTime, Dictionary<string, TransactionChange>> Changelog { get; set; }

}

​

public class TransactionChange

{

    public string From { get; set; }

    public string To { get; set; }

}

​