code: func (r Account) GetPendingInvoiceTopLevelItems() (resp []datatypes.Billing_Invoice_Item, err error) {
  	err = r.Session.DoRequest("SoftLayer_Account", "getPendingInvoiceTopLevelItems", nil, &r.Options, &resp)
  	return
  }
docs: // Retrieve A list of top-level invoice items that are on an account's currently pending invoice.