code: public com.google.api.ads.adwords.axis.v201809.cm.CustomParameters getPromotionUrlCustomParameters() {
          return promotionUrlCustomParameters;
      }
docs: Gets the promotionUrlCustomParameters value for this PromotionFeedItem.
  
  @return promotionUrlCustomParameters   * A list of mappings to be used for substituting URL custom parameter
  tags in the
  trackingUrlTemplate, finalUrls, and/or finalMobileUrls.