static void Main(string[] args)
{
string filename = @"C:\temp\test.docx";
string watermark = @"C:\temp\you dont say.png";
string sContents = Convert.ToBase64String(File.ReadAllBytes(filename));
string sWatermark = Convert.ToBase64String(File.ReadAllBytes(watermark));
//string sPayload = $"{{\"type\":\"Word\",\"content\":\"{sContents}\",\"watermark\":{{\"type\":\"Text\",\"font\":\"Helvetica\",\"fontSize\":\"48\",\"fontColor\":\"#00FF00\",\"text\":\"this is a textmark\"}}}}";
string sPayload = $"{{\"type\":\"Word\",\"content\":\"{sContents}\",\"watermark\":{{\"type\":\"Image\",\"image\":\"{sWatermark}\"}}}}";
Payload payload = Payload.Parse(sPayload);
byte[] bDocument = Converter.Get(payload.Type).Convert(payload.Content);
if (payload.Watermark != null)
{
using (Watermarker watermarker = Watermarker.Get(payload.Watermark)) {
bDocument = watermarker.Watermark(bDocument);
}
}
File.WriteAllBytes(@"C:\temp\test.pdf", bDocument);
}