QRCode

To display a QRCode on your edit page put this code in html editor where you want the display :
<IFRAME height=150

src="https://chart.googleapis.com/chart?chs=150x150&cht=qr&chl=http://ADRESSOFYOUREDITPAGE?editid1={$show_key1}&choe=UTF-8"; frameBorder=0 width=150 > </IFRAME>
For the print page use the same code but :

put {$id_client_value} instead of {$show_key1}
Hope this help !
Guillaume CASTRE