public function getActiveCampaignPage($campaign) {
    // Check if Campaign is Paused.
    $isPaused = $campaign->get('field_pause_campaign')->value;
    $fieldPauseLandingPage = $campaign->get('field_pause_landing_page')->getValue();
    $landingPageIds = [];
    if ($isPaused && isset($fieldPauseLandingPage[0]['target_id'])) {
      $landingPageIds[] = $fieldPauseLandingPage[0]['target_id'];
    }
    else {
      $fieldCampaignPages = $campaign->get('field_campaign_pages')->getValue();
      foreach ($fieldCampaignPages as $field) {
        $landingPageIds[] = $field['target_id'];
      }
    }
    /** @var \Drupal\node\NodeStorage $nodeStorage */
    $nodeStorage = $this->entityTypeManager->getStorage('node');

    // Load Landing page and check if it's published.
    $landingPages = $nodeStorage->loadMultiple($landingPageIds);
    /** @var \Drupal\node\Entity\Node $node */
    foreach ($landingPages as $node) {
      if ($node->isPublished()) {
        $publishedPages[] = $node;
      }
    }

    // If all pages are disabled, show Pause page.
    if (empty($publishedPages) && isset($fieldPauseLandingPage[0]['target_id'])) {
      return $nodeStorage->load($fieldPauseLandingPage[0]['target_id']);
    }

    return reset($publishedPages);
  }