I am looking for a way to modify Chad's script (Here) to add a stamp to a Laserfiche Document (PDF).  In Chad's script he is taking a document outside of Laserfiche and copying it, and creating a new document with the stamp applied.  I have this functionality working great, but I am looking to go a bit further with it.  The idea is to take a State Form, gather the field information in LF Forms, populate that into a Fillable PDF, then take the LF Forms signature and apply that to the PDF, keeping everything in Laserfiche.  (See workflow below)  I think I have the logic, now I just need to turn that into code - I believe it involves modifying this:

using (Stream inputPdfStream = new FileStream("C://unsigned.pdf", FileMode.Open, FileAccess.Read, FileShare.Read))

but I'm not sure how to reference the Fillable PDF document using 'This.'   

{
            string sigimg = GetTokenValue("RetrieveFieldValues_datafield").ToString();
            //string loc = Entry
            byte[] imageBytes = Convert.FromBase64String(sigimg);
            string name = GetTokenValue("Entry Name").ToString();
           // MemoryStream ms = new MemoryStream(imageBytes, 0, imageBytes.Length);

            using (Stream inputPdfStream = new FileStream("C://unsigned.pdf", FileMode.Open, FileAccess.Read, FileShare.Read))
            using (Stream inputImageStream = new MemoryStream(imageBytes, 0, imageBytes.Length))
            using (Stream outputPdfStream = new FileStream("C://TestSignatures//" + name + ".pdf", FileMode.Create, FileAccess.Write, FileShare.None))
            {
                var reader = new PdfReader(inputPdfStream);
                var stamper = new PdfStamper(reader, outputPdfStream);
                var pdfContentByte = stamper.GetOverContent(1);

                Image image = Image.GetInstance(inputImageStream);
                image.SetAbsolutePosition(250, 250);//(left/right, top/bottom)
                image.ScaleAbsolute(100f, 25f);//left/right, top/bottom
                pdfContentByte.AddImage(image);
                stamper.Close();
            }

Any guidance is much appreciated!  

Nate