Enable and configure ticket design
Use pretix to generate tickets for the user to download and print out.
The ticket design can be customized with pretix's PDF ticket editor. There, you can upload a PDF file used as a background for the tickets and then place various texts and QR codes on the background at the positions of your choice. The editor is easy to use thanks to its drag-and-drop user interface.
This can be configured at https://pretix.allmende.io/control/event/degrowth/malmo2018/settings/tickets
@viktoriya.kulikova would you like to setup this, or provide me with a PDF from your side with the background for the tickets? Do you have any additional requirements of what the tickets should contain?