+<?php
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Simple server based on https://bshaffer.github.io/oauth2-server-php-docs/cookbook
+
+$dsn = 'mysql:dbname=kairo_at_auth;host=localhost';
+$username = 'kairo_at_auth';
+$password = '6z0KIuUsHJhgD5rB';
+
+// error reporting (this is a demo, after all!)
+ini_set('display_errors',1);error_reporting(E_ALL);
+
+// Autoloading (composer is preferred, but for this example let's just do this)
+require_once('../oauth2-server-php/src/OAuth2/Autoloader.php');
+OAuth2\Autoloader::register();
+
+// $dsn is the Data Source Name for your database, for exmaple "mysql:dbname=my_oauth2_db;host=localhost"
+$storage = new OAuth2\Storage\Pdo(array('dsn' => $dsn, 'username' => $username, 'password' => $password));
+
+// Pass a storage object or array of storage objects to the OAuth2 server class
+$server = new OAuth2\Server($storage);
+
+// Add the "Client Credentials" grant type (it is the simplest of the grant types)
+$server->addGrantType(new OAuth2\GrantType\ClientCredentials($storage));
+
+// Add the "Authorization Code" grant type (this is where the oauth magic happens)
+$server->addGrantType(new OAuth2\GrantType\AuthorizationCode($storage));
+
+?>