Hi Katarzyna.
In the document template generation you can find a "2D Code" under System Fields > Information.
The 2D Code is a QR code that will link to the process instance.
PS. Another cool feature using QR codes is under the start buttons. If you generate a QR code there you can kick off a new process by scanning a QR code.
Hi Mark,
I'm afraid that the 2d code contains the element ID but not the hyperlink.
but I may be wrong...