code: func (r Product_Item_Category) GetAdditionalProductsForCategory() (resp []datatypes.Product_Item, err error) {
  	err = r.Session.DoRequest("SoftLayer_Product_Item_Category", "getAdditionalProductsForCategory", nil, &r.Options, &resp)
  	return
  }
docs: // Returns a list of of active Items in the "Additional Services" package with their active prices for a given product item category and sorts them by price.