Watermark the printable receipt

Currently, the printable receipt is just black on white, basic font, and two boxes. It’s super easy to fabricate. As in, even nontechnical people have a difficult time taking it as proof that the Moneroj changed hands. As a result, it’s challenging to use as proof for banks if there’s a banking chargeback. Something more official-looking would be tremendously helpful.

Could you give a specific example (picture) of what you think is optimal?

For example from a quick mail search Hetzner, StackOverflow Careers, Lufthansa, or Austrian. Unfortunately, most of them contain personal information, but the Austrian one is usable:

Would it help if there was some kind of verification code that could be validated via the website / the site admin?