Hello
@miniature-angle-43834
As far as I can tell PAR is implemented in Fosite (the library that powers Hydra):
https://github.com/ory/fosite/pull/660 ,
but not yet in Hydra itself.
So there is still some work to be done to fully implement it, currently no plans.
If you are interested in sponsoring that feature please do book a call with us here to discuss the timeline/budget/details:
https://ory.sh/talk-to-us