C# Integration

using System;
using System.Net.Http;
using System.Text;
using System.Text.Json;
using System.Security.Cryptography;
using System.Threading.Tasks;

public class Authorized
{
    private static readonly HttpClient client = new();
    private const string BASE = "https://authorized.lol/api/v1";
    private readonly string apiKey;

    public Authorized(string apiKey) => this.apiKey = apiKey;

    public static string GetHWID()
    {
        using var sha = SHA256.Create();
        var bytes = sha.ComputeHash(Encoding.UTF8.GetBytes(Environment.MachineName));
        return BitConverter.ToString(bytes).Replace("-", "").ToLower();
    }

    public async Task<string> Init(string licenseKey)
    {
        var res = await Post("/init", new { api_key = apiKey, license_key = licenseKey, hwid = GetHWID() });
        if (!res.GetProperty("success").GetBoolean())
            throw new Exception(res.GetProperty("message").GetString());
        return res.GetProperty("session_token").GetString()!;
    }

    public async Task<bool> Validate(string sessionToken)
    {
        var res = await Post("/validate", new { api_key = apiKey, session_token = sessionToken });
        return res.GetProperty("success").GetBoolean();
    }

    public async Task DownloadFile(string fileId, string savePath)
    {
        var req = new HttpRequestMessage(HttpMethod.Get, BASE + "/files/" + fileId);
        req.Headers.Add("x-api-key", apiKey);
        var res = await client.SendAsync(req);
        await File.WriteAllBytesAsync(savePath, await res.Content.ReadAsByteArrayAsync());
    }

    private async Task<JsonElement> Post(string path, object body)
    {
        var content = new StringContent(JsonSerializer.Serialize(body), Encoding.UTF8, "application/json");
        var res = await client.PostAsync(BASE + path, content);
        return JsonSerializer.Deserialize<JsonElement>(await res.Content.ReadAsStringAsync());
    }
}

// Usage
var auth = new Authorized("your_api_key");
var session = await auth.Init("XXXXX-XXXXX-XXXXX");
await auth.DownloadFile("abc-file-id", @"C:\output\update.exe");