using System.Security.Cryptography;

using System.Text;

using System;

​

public class Program

{

    public static void Main()

    {

        var key = "Abc123";

​

        var baseUrl = "https://api.commissionfactory.com/V1_1/Affiliate/Transactions";

​

​

        var baseString = $"POST&{UriEncode(baseUrl)}&{UriEncode($"apiKey={key}")}";

​

        Console.WriteLine(baseString);

​

        var signature = GetSignature(baseString, "abc123");

​

        var url =

            $"https://api.commissionfactory.com/V1_1/Affiliate/Transactions?apiKey={key}&signature={UriEncode(signature)}";

​

        Console.WriteLine(signature);

​

        Console.WriteLine(url);

​

        Console.ReadKey();

    }

​

    private static string UriEncode(string value) => Uri.EscapeDataString(value);

​

    private static string GetSignature(string message, string secret)

    {

        var encoding = new ASCIIEncoding();

        var keyByte = encoding.GetBytes(secret);

        var messageBytes = encoding.GetBytes(message);

        using var hasher = new HMACSHA1(keyByte);

        var hashMessage = hasher.ComputeHash(messageBytes);

        var str = BitConverter.ToString(hashMessage).Replace("-", "").ToLower();

        var plainTextBytes = System.Text.Encoding.UTF8.GetBytes(str);

        return System.Convert.ToBase64String(plainTextBytes);

    }

}