public function SendNotificationChannelVerificationCode(\Google\Cloud\Monitoring\V3\SendNotificationChannelVerificationCodeRequest $argument,
      $metadata = [], $options = []) {
        return $this->_simpleRequest('/google.monitoring.v3.NotificationChannelService/SendNotificationChannelVerificationCode',
        $argument,
        ['\Google\Protobuf\GPBEmpty', 'decode'],
        $metadata, $options);
    }