<script async src="https://telegram.org/js/telegram-widget.js?22" data-telegram-login="combot" data-size="large" data-onauth="onTelegramAuth(user)" data-request-access="write"></script> <script type="text/javascript"> function onTelegramAuth(user) { alert('Logged in as ' + user.first_name + ' ' + user.last_name + ' (' + user.id + (user.username ? ', @' + user.username : '') + ')'); } </script>