TOPIC: pre-sale: watermark, print only once

Hello,
I'd like to use this extension to make giftcards pdf-files sales. I was thinking that maybe a one-time printing ability will be great but when search the forum I found an old post that look even better:
[TO BE ADDED] Watermark PDFs with name of purchaser
where you say that it's possible. I want to make sure that this feature is available, so I can make a pdf giftcard file and every buyer get a pdf file with his details watermarked or something similar.
Thank you!

Please excuse my delayed reply, we were having some technical issues with the hosting provider. Regarding your question:

We have implemented QR codes for PDF files which once scanned provide information for the buyer, there is no image watermark yet.

Regarding the print once pdf request, I do not think the PDF format supports that :/

Do you have any more questions?

Thank you!