using System;

using System.Collections.Generic;

using System.Linq;

using System.Text.Json;

using System.Security.Cryptography;

using System.Text;

using System.IO;

using System.Threading;

using System.Globalization;

using System.Text.Encodings.Web;

using System.Text.Json;

using System.Text.RegularExpressions;

using System.Text.Unicode;

​

public class Program

{   

    public static void Main()

    {

        var json = Parse(data);

        var hash = "c617cb5aa79887e2091dfe3bfe28ef82";

        var secret = "dGIcZ!See18dODMeFg1fPgi2hJiAXJ3G";

        var str = Regex.Replace(JsonSerializer.Serialize(JsonDocument.Parse(json)).Replace("\\\\", "\\").Replace("\\u002B","+")

            .Replace("u0022", "\"").Replace("\\/","\\\\/"), @"\\u.{4}", x => x.ToString().ToLower()) + $"&{secret}";

        Console.WriteLine(Md5(str));

    }

    public static string Md5(string originalPassword)

    {

        Byte[] originalBytes;

        Byte[] encodedBytes;

        MD5 md5;

​

        // Conver the original password to bytes; then create the hash

        md5 = new MD5CryptoServiceProvider();

        originalBytes = ASCIIEncoding.Default.GetBytes(originalPassword);

        encodedBytes = md5.ComputeHash(originalBytes);

​

        // Bytes to string

        return System.Text.RegularExpressions.Regex.Replace(BitConverter.ToString(encodedBytes), "-", "").ToLower();

    }

    public static string Parse(string json)

    {

        using (MemoryStream memoryStream1 = new MemoryStream())

        {

            using (Utf8JsonWriter utf8JsonWriter1 = new Utf8JsonWriter(memoryStream1))

            {

                using (JsonDocument jsonDocument = JsonDocument.Parse(json))

                {

                    var properties = jsonDocument.RootElement.EnumerateObject().ToList();

                    if (properties.Any(x => x.Name.ToLower() == "action"))

                        return json;

​

                    utf8JsonWriter1.WriteStartObject();

                    bool isActionInserted = false;

                    foreach (var path in properties)

                    {

                        var dk = new CultureInfo("en-US");

                        Thread.CurrentThread.CurrentCulture = dk ;

                        var sc1 = dk.CompareInfo.GetSortKey(path.Name);

                        var sc2 = dk.CompareInfo.GetSortKey("action");

                        int result1 = SortKey.Compare(sc1, sc2);

                        if (result1 > 0 && !isActionInserted)

                        {

                            isActionInserted = true;

                            utf8JsonWriter1.WriteString("action", "pizda");

                        }

                        path.WriteTo(utf8JsonWriter1);

                    }

                    utf8JsonWriter1.WriteEndObject();

                }

             }

​

            var resultJson = Encoding.UTF8.GetString(memoryStream1.ToArray());

            return resultJson;

        }

    }

    public static string data = @"{""action"": ""payment"", ""app_id"": ""868"", ""appId"": ""868"", ""appVersion"": ""1.28"", ""device"": {""advertisingIdentifier"": ""de4fa876-ea38-4520-9969-faa9c18c2b1a"", ""atime"": ""1651584283"", ""carrier"": ""KYIVSTAR"", ""country"": ""UA"", ""deviceName"": ""vivo V2027"", ""deviceSerial"": """", ""displayHeight"": ""1470"", ""displayScale"": ""1"", ""displayWidth"": ""720"", ""flags"": ""0"", ""googleAccountPrimary"": """", ""id"": ""de4fa876-ea38-4520-9969-faa9c18c2b1a"", ""identifierForVendor"": """", ""IMEI"": """", ""ip"": ""1596954543"", ""isJailbreak"": ""0"", ""isPayment"": ""1"", ""isTest"": ""0"", ""language"": ""ru"", ""lastActiveTime"": ""1651584251"", ""localizedModel"": ""vivo V2027"", ""macAddress"": """", ""macAddressWiFi"": """", ""memoryMax"": ""3702.00"", ""model"": ""vivo V2027"", ""odin1"": """", ""platform"": ""Android"", ""reachability"": ""2"", ""registerTime"": ""1646774504"", ""systemName"": ""Android"", ""systemVersion"": ""10"", ""timeZone"": ""+0300"", ""udid"": ""8070b4ca3378730e""}, ""device_application"": {""applicationBuild"": ""30"", ""applicationId"": ""868"", ""applicationVersion"": ""1.29"", ""atime"": ""1654253972"", ""countExit"": ""0"", ""countRun"": ""0"", ""country"": ""UA"", ""day_time"": ""1651525200"", ""deviceId"": ""de4fa876-ea38-4520-9969-faa9c18c2b1a"", ""displayName"": ""My.Games Cloud"", ""eregisterTime"": ""0"", ""id"": ""3663110470"", ""identifier"": ""games.my.cloud"", ""isPayment"": ""1"", ""lastActiveTime"": ""1651584277"", ""loginTime"": ""1651584251"", ""logoutTime"": ""1651584277"", ""memoryUse"": ""48.00"", ""month_time"": ""1654117200"", ""name"": ""My.Games Cloud"", ""online"": ""0"", ""platform"": ""Android"", ""registerTime"": ""1646774504"", ""retention_flags"": ""12"", ""source"": """", ""week_time"": ""1652130000""}, ""payment"": {""appBuild"": ""29"", ""appId"": ""868"", ""appVersion"": ""1.28"", ""atime"": ""1654253972"", ""country"": ""UA"", ""device_type"": ""Android"", ""deviceId"": ""de4fa876-ea38-4520-9969-faa9c18c2b1a"", ""devicePlatform"": ""Android"", ""expires_date"": 1656846065, ""id"": ""145649887"", ""localizedModel"": ""vivo V2027"", ""money"": ""13.60"", ""originalTransactionId"": ""GPA.3353-2994-3215-78673"", ""paymentEUR"": ""15"", ""paymentRUB"": ""973.88"", ""paymentUSD"": ""15.82"", ""platform"": ""Android"", ""productDescription"": ""{\""s\"":1648976779,\""e\"":1656846065,\""clientSent\"":0}"", ""productlocale"": ""UAH"", ""productPrice"": ""464.99"", ""productTitle"": ""Месяц MY.GAMES (MY.GAMES Cloud — играйте в игры для ПК на телефоне)"", ""sandbox"": ""0"", ""sendToServer"": ""0"", ""source"": """", ""start_date"": 1648976779, ""status"": ""1"", ""stime"": ""1654253972"", ""subscription"": true, ""transactionId"": ""GPA.3353-2994-3215-78673..1"", ""transactionIdentifier"": ""games.my.cloud.month_mygames"", ""transactionReceipt"": ""{\""data\"":\""{\\\\\""orderId\\\\\"":\\\\\""GPA.3353-2994-3215-78673\\\\\"",\\\\\""packageName\\\\\"":\\\\\""games.my.cloud\\\\\"",\\\\\""productId\\\\\"":\\\\\""games.my.cloud.month_mygames\\\\\"",\\\\\""purchaseTime\\\\\"":1648976779261,\\\\\""purchaseState\\\\\"":0,\\\\\""purchaseToken\\\\\"":\\\\\""fpcpaegnlonhejnacbjiphgg.AO-J1Oy2hFbzYnt3Jl4l4II7DHS36SdAkVW8M0NVCkySRxHDzRSuk-nbMHRh-sVU4NXH2IuMIqDM_H1KXwb8hTYWP2o3KKxzxw\\\\\"",\\\\\""obfuscatedAccountId\\\\\"":\\\\\""3aaed5a153784bce63a63e6464122b32\\\\\"",\\\\\""autoRenewing\\\\\"":true,\\\\\""acknowledged\\\\\"":false}\"",\""signature\"":\""KZxC+in3TDvOgjpFneWbCX5MYx\\\\/aC4kwYmWCWvydV8oPYqhFj1zO4euzc4j7b6JKY39sgzxXIKQ+qWSXveqT7CkcZdElDta44sf8zKdIqFTxpBR9P\\\\/lqIJ1y363faa7aYm4PttbOXOlXj2dbCRf8rc\\\\/1QXNx43jI3BkL5OCtFdjQA1VX5p+vTcKyAzEFraIF1zAUwPp4Z\\\\/EApjC7DEtrYfU3sglXaaxrzA\\\\/XLRfTIqkzwpIUPiqBLMF0J\\\\/IgK3Cyt83X9S\\\\/rFUj3Ppiqe0taqNunBmw7nnJohHUqrHhkBzTdDF4j+k35KRwo5GAqhy66d9VUv+5HjOo8y3QDz\\\\/G\\\\/Qw==\""}"", ""userId"": ""47841671""}, ""request_user_id"": ""47841671"", ""requestUserId"": ""47841671"", ""user"": {""appBuild"": ""30"", ""appId"": 868, ""appVersion"": ""1.29"", ""atime"": 1651584268, ""country"": ""UA"", ""createTime"": 1648925432, ""data"": """", ""deviceName"": ""vivo V2027"", ""flags"": 0, ""freezeTime"": 1654253972, ""id"": ""47841671"", ""language"": ""ru"", ""loginTime"": 1651584261, ""logoutTime"": 0, ""mygamesUserId"": """", ""payment"": true, ""registerBonus"": false, ""registerTime"": 1648925432, ""slot"": 0, ""stime"": 1648925432, ""updateTime"": 1651584268, ""userId"": ""47841671""}}";

}