code: public void setDiscountType(com.google.api.ads.admanager.axis.v201808.LineItemDiscountType discountType) {
          this.discountType = discountType;
      }
docs: Sets the discountType value for this LineItemSummary.
  
  @param discountType   * The type of discount being applied to a {@code LineItem}, either
  percentage
  based or absolute. This attribute is optional and
  defaults to
  {@link LineItemDiscountType#PERCENTAGE}.