Review this AI-generated endpoint for downloading invoices.

@GetMapping("/invoices/{id}/pdf")
@PreAuthorize("isAuthenticated()")
public ResponseEntity<byte[]> download(@PathVariable long id) {
    Invoice invoice = invoiceRepository.findById(id).orElseThrow();
    return ResponseEntity.ok()
        .contentType(MediaType.APPLICATION_PDF)
        .body(pdfRenderer.render(invoice));
}