code: @Override
  	public com.liferay.commerce.discount.model.CommerceDiscount updateCommerceDiscount(
  		com.liferay.commerce.discount.model.CommerceDiscount commerceDiscount) {
  		return _commerceDiscountLocalService.updateCommerceDiscount(commerceDiscount);
  	}
docs: Updates the commerce discount in the database or adds it if it does not yet exist. Also notifies the appropriate model listeners.
  
  @param commerceDiscount the commerce discount
  @return the commerce discount that was updated