Licensing you can actually verify.

From source·github.com/Rudevin17/rudeauth-cpp·C++17 static library

#include <rudeauth/rudeauth.hpp>

rudeauth::Client client(APP_ID, PUBLIC_KEY,
                        "https://api.rudeauth.com");

auto auth = client.authenticate(userKey);
if (!auth.ok()) return 1;          // no bool to patch
auto session = auth.value();

go get github.com/Rudevin17/rudeauth-go·source

import "github.com/Rudevin17/rudeauth-go"

client, err := rudeauth.NewClient(appID, publicKey,
    "https://api.rudeauth.com")
if err != nil { return err }

// sentinel errors, e.g. rudeauth.ErrLicenseExpired
sess, err := client.Authenticate(userKey)
if err != nil { return err }
defer sess.Close()

dotnet add package RudeAuth·source

using RudeAuth;

using var client = new RudeAuthClient(appId, publicKey,
    "https://api.rudeauth.com");

// throws RudeAuthException on failure
using var session = client.Authenticate(userKey);

pip install rudeauth·source

from rudeauth import Client, RudeAuthError

client = Client(app_id, public_key, "https://api.rudeauth.com")
# raises RudeAuthError on failure
session = client.authenticate(user_key)

cargo add rudeauth·source

use rudeauth::Client;

let client = Client::new(app_id, public_key,
    "https://api.rudeauth.com")?;
let session = client.authenticate(user_key)?;