code: public Invoice voidInvoice(RequestOptions options) throws StripeException {
      return voidInvoice((Map<String, Object>) null, options);
    }
docs: Mark a finalized invoice as void. This cannot be undone. Voiding an invoice is similar to <a
  href="#delete_invoice">deletion</a>, however it only applies to finalized invoices and
  maintains a papertrail where the invoice can still be found.