I usually sign documents on my iPad but in this case they told me the signature had to be from a pen. COVID and everything means I don't have a printer nor a scanner at home so I developed this to "scan my iPad signed documents" worked like a charm!
It's interesting that the problem they had was with the signature. You can very easily make a handwritten signature on an iPad. I don't see how there's any practical way to tell the difference between a high-quality, handwritten signature done on an iPad with either a finger or an Apple Pencil and a scanned signature done with a pen.
Are you sure that's not just some excuse they gave you?
Ironically, despite being hosted on tex.stackexchange.com, all of the answers use ImageMagick, Photoshop, or Windows 10/Adobe Acrobat.
[1] http://hanno-rein.de/archives/349
[2] http://mirrors.concertpass.com/tex-archive/macros/luatex/lat...