telegram_check.php

<?php
require_once ("config.php");
require_once ("classes/telegram.php");
require_once ("classes/subscriber.php");
require_once ("classes/db-class.php");
$db = new SSDB();
define("NAME", $db->getSetting($mysqli,"name"));
define("TITLE", $db->getSetting($mysqli,"title"));
define("WEB_URL", $db->getSetting($mysqli,"url"));
define("MAILER_NAME", $db->getSetting($mysqli,"mailer"));
define("MAILER_ADDRESS", $db->getSetting($mysqli,"mailer_email"));
define("SUBSCRIBE_TELEGRAM", $db->getBooleanSetting($mysqli, "subscribe_telegram"));
define("SUBSCRIBE_TELEGRAM", $db->getBooleanSetting($mysqli, "subscribe_telegram"));
define("TG_BOT_API_TOKEN", $db->getSetting($mysqli, "tg_bot_api_token"));
define("TG_BOT_USERNAME", $db->getSetting($mysqli, "tg_bot_username"));

$telegram   = new Telegram();
$subscriber = new Subscriber();

try {
    $auth_data = $telegram->checkTelegramAuthorization($_GET);
    $telegram->saveTelegramUserData($auth_data);
} catch (Exception $e) {
    die($e->getMessage());
}

// Check if user is registered in DB
$subscriber->firstname = $auth_data['first_name'];
$subscriber->lastname  = $auth_data['last_name'];
$subscriber->typeID    = 1;
$subscriber->userID    = $auth_data['id'];
$subscriber->active    = 1; // Telegram user should always be active if they can be validated

$subscriber_id  = $subscriber->get_subscriber_by_userid(true); // If user does not exists, create it
$subscriber->id = $subscriber_id;

// make sure we don't have a logged in email subscriber
$subscriber->set_logged_in();

header('Location: subscriptions.php');