(rQRcode)1 seems like it's a good choice for this. It's homepage even shows how to generate a table element with background colors for the QR code. Perhaps that works with PrinceXML? (I haven't used it, so I don't know what it's capabilities are.)
Granted, the current method works well, but let's give that poor server a rest.
PS: Off topic, but where did you print the books? Did they accept the raw PDF and boom? Prices?
(rQRcode)1 seems like it's a good choice for this. It's homepage even shows how to generate a table element with background colors for the QR code. Perhaps that works with PrinceXML? (I haven't used it, so I don't know what it's capabilities are.)
Granted, the current method works well, but let's give that poor server a rest.
PS: Off topic, but where did you print the books? Did they accept the raw PDF and boom? Prices?