code: public void setClickThroughConversionCost(com.google.api.ads.admanager.axis.v201902.Money clickThroughConversionCost) {
          this.clickThroughConversionCost = clickThroughConversionCost;
      }
docs: Sets the clickThroughConversionCost value for this LineItemActivityAssociation.
  
  @param clickThroughConversionCost   * The amount of money to attribute per click through conversion.
  This attribute is
  required for creating a {@code LineItemActivityAssociation}.
  The currency code is readonly
  and should match the {@link LineItem}.