test.cs

[HttpPost]
public IActionResult ProcessSignature([FromBody] TXTextControl.Web.MVC.DocumentViewer.Models.SignatureData data)
{
    if (data == null)
    {
        return BadRequest();
    }

    string signatureDataJson = JsonConvert.SerializeObject(data.SignatureLines);
    string hash = CreateHash(signatureDataJson);

    Envelope envelope = new Envelope
    {
        DocumentId = data.UniqueId,
        SignatureHash = hash,
        SignatureData = signatureDataJson
    };

    AddEnvelope(envelope);

    if (SaveSignedPDF(data, envelope))
    {
        return Ok(true);
    }
    else
    {
        return StatusCode(500);
    }
}