protected function setAppId() {
    if ($app_id = $this->getConfigValue('cloud.appId')) {
      $this->appId = $app_id;
    }
    else {
      $this->say("<info>To generate an alias for the Acquia Cloud, BLT require's your Acquia Cloud application ID.</info>");
      $this->say("<info>See https://docs.acquia.com/acquia-cloud/manage/applications.</info>");
      $this->appId = $this->askRequired('Please enter your Acquia Cloud application ID');
      $this->writeAppConfig($this->appId);
    }
  }