public async Task <IActionResult> CreateCertificateAsync(int invoiceId, [FromQuery] string language)
{
var stream = await _documentGenerationManager.CreateCertificateForInvoiceAsync(invoiceId, language);
var file = new FileStreamResult(stream, "application/pdf");
file.FileDownloadName = $"{invoiceId}_attest.pdf";
return(file);
}