using System;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        string jsonString = "{\"data\":{\"merchantRefNo\":\"foo\"," +

            "\"responseText\":\"Approved\"," +

            "\"status\":\"A\"," +

            "\"txnDate\":\"20220321\"," +

            "\"txnId\":\"000067\"," +

            "\"txnTime\":\"1049\"," +

            "\"txnType\":\"sale\"," +

            "\"amt\":\"109\"}," +

            "\"dataType\":\"trans\"}";

        var result =JsonConvert.DeserializeObject<Root>(jsonString);

        Console.WriteLine(result.dataType);

        Console.WriteLine(result.data.merchantRefNo);

        Console.WriteLine(result.data.status);

        Console.WriteLine(result.data.txnId);       

    }

}

​

public class Data

{

    public string merchantRefNo { get; set; }

    public string responseText { get; set; }

    public string status { get; set; }

    public string txnDate { get; set; }

    public string txnId { get; set; }

    public string txnTime { get; set; }

    public string txnType { get; set; }

    public string amt { get; set; }

}

​

public class Root

{

    public Data data { get; set; }

    public string dataType { get; set; }

}

​