code: public com.google.api.ads.adwords.axis.v201809.cm.FeedType getExtensionType() {
          return extensionType;
      }
docs: Gets the extensionType value for this CampaignExtensionSetting.
  
  @return extensionType   * The extension type the extension setting applies to.
  <span class="constraint Required">This field is required
  and should not be {@code null}.</span>