code: public com.google.api.ads.admanager.axis.v201805.ProductType getProductType() {
          return productType;
      }
docs: Gets the productType value for this Product.
  
  @return productType   * The type of {@code Product}. This will always be {@link ProductType#DFP}
  for programmatic
  guaranteed products.
  <span class="constraint ReadOnly">This attribute is
  read-only when:<ul><li>using programmatic guaranteed, using sales
  management.</li><li>not using programmatic, using sales management.</li></ul></span>