public function getData()
  {
    if($this->logout)
    {
      $buttons = new MessageButton( MessageButton::TYPE_ACCOUNT_UNLINK, '');
    }
    else
    {
      $buttons = new MessageButton( MessageButton::TYPE_ACCOUNT_LINK, '', $this->url);
    }
    
    $result = [
      'title' => $this->title,
      'subtitle' => $this->subtitle,
      'image_url' => $this->image_url,
      'buttons' => [$buttons->getData()]
    ];
    return $result;
  }