code: func (r Billing_Item_Cancellation_Reason) GetBillingItems() (resp []datatypes.Billing_Item, err error) {
  	err = r.Session.DoRequest("SoftLayer_Billing_Item_Cancellation_Reason", "getBillingItems", nil, &r.Options, &resp)
  	return
  }
docs: // Retrieve The corresponding billing items having the specific cancellation reason.