You could definitely use php or another program to generate a pdf on the fly.
I have seen a few companies do it, where their gift certificate is an elaborate picture / promotion, with a white box somewhere on the page. They dynamically generate the pdf with the picture as the background and use a separate layer to fill in the code in the box of the certificate. I don't think it would be extremely hard, but I haven't seen a program that does it.
I would check hotscripts maybe, and keep asking around. I'm sure that something exists out there.
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