code: public void setCostPerUnit(com.google.api.ads.admanager.axis.v201805.Money costPerUnit) {
          this.costPerUnit = costPerUnit;
      }
docs: Sets the costPerUnit value for this LineItemSummary.
  
  @param costPerUnit   * The amount of money to spend per impression or click. This
  attribute is
  required for creating a {@code LineItem}.