Setup pretix widget for embedding in scriptum
A widget of pretix can be generated and embedded on a separate site. In particular, we require a widget visible for the users with accepted papers on the conference platform, showing only the non-public ticket types (#227 (closed)).
The widget will include a pre-defined voucher code for allowing access to these special tickets.
Configuration is done on https://pretix.allmende.io/control/event/degrowth/malmo2018/settings/widget