code: func (r Product_Package) GetConfiguration() (resp []datatypes.Product_Package_Order_Configuration, err error) {
  	err = r.Session.DoRequest("SoftLayer_Product_Package", "getConfiguration", nil, &r.Options, &resp)
  	return
  }
docs: // Retrieve The item categories associated with a package, including information detailing which item categories are required as part of a SoftLayer product order.