Use variable or function for target org file about orca

[abo-abo]

It only works with a string, but you can have your config work by using quasi-quote:

(setq orca-handler-list
      `((orca-handler-match-url
         "https://www.reddit.com/r/emacs"
         ,(concat org-directory "refile.org") "\\* Reddit")
        (orca-handler-match-url
         "https://emacs.stackexchange.com/"
         ,org-default-notes-file "\\* Questions")
        (orca-handler-file
         "~/org/refile.org" "\\* Refile")))

[dakra]

Great. Thank you very much.
Now looking at it I see that your solution is also the way I define org-capture-templates already so should have figured it out myself.