This You’ve Been BOOed free printable is the perfect way to share the holiday fun! Surprise your friends and neighbors with a basket full of goodies, complete with instructions on how to pay it ...
So, using US-ASCII printable characters only (e.g., binary data encoded in Base64 before passing it to a QR Code generator) is the safest choice for QR code against the heuristics. This will also overcome another complication: that ISO-8859-1 was not the default encoding in earlier QR code standard published in 2000 (ISO/IEC 18004:2000).