using System;

using System.Collections.Generic;

using System.Linq;

using System.Net.Http;

using System.Web;

public class Program

{

    public static void Main()

    {

        string action = "/Products/Search";

        Dictionary<string, string> apiParams = new Dictionary<string, string>();

        apiParams.Add("Country", "PL");

        apiParams.Add("Language", "PL");

        apiParams.Add("SearchPlain", "TS4148 RYG");

        apiParams.Add("Token", "TOKEN");

            // All code in this function is based on documentation https://developers.tme.eu/en/

​

            string uri = $@"https://api.tme.eu/{action}.json";

​

            string queryParams = string.Join("&", apiParams.Select(kvp => $"{Uri.EscapeDataString(kvp.Key)}={Uri.EscapeDataString(kvp.Value)}"));

​

            // Calculate signature basis according the documentation

            string escapedUri = HttpUtility.UrlEncode(uri);

            string escapedParams = HttpUtility.UrlEncode(queryParams);

            string signatureBase = $"POST&{escapedUri}&{escapedParams}";

        Console.WriteLine(signatureBase);

    }

}