code: public com.google.api.ads.adwords.axis.v201809.cm.FeedItemCampaignTargeting getCampaignTargeting() {
          return campaignTargeting;
      }
docs: Gets the campaignTargeting value for this ExtensionFeedItem.
  
  @return campaignTargeting   * Campaign targeting specifying what campaign this extension
  can serve with.
  On update, if the field is left unspecified, the previous
  campaign targeting state
  will not be changed.
  On update, if the field is set with an empty FeedItemCampaignTargeting,
  the
  campaign targeting will be cleared.
  Note: If adGroupTargeting and campaignTargeting are
  set (either in the request or pre-existing
  from a previous request), the targeted campaign must
  match the targeted adgroup's campaign.
  If only adGroupTargeting is specified and there is
  no campaignTargeting, then a
  campaignTargeting will be set to the targeted adgroup's
  campaign.