public function execute()
{
$message = $this->getMessage();
$chat_id = $message->getChat()->getId();
$member = $message->getNewChatMember();
$text = 'Hi there!';
if (!$message->botAddedInChat()) {
$text = 'Hi ' . $member->tryMention() . '!';
}
$data = ['chat_id' => $chat_id, 'text' => $text];
return Request::sendMessage($data);
}