"my app isn't webpage-based, and i just want an oauth token to make privileged requests with"

then you've come to the right place!

1. sign into bungie.net
2. visit bungie.net/en/Application
3. set OAuth Client Type to Confidential
4. set Redirect URL to

   https://paracausal.science/oauth/

5. set Origin Header to

   https://paracausal.science

6. hit save!!
7. seriously, hit save on that page
8. fill in details below
9. only THEN, click the link

client_id:
client_secret:

only with ALL details filled in, click this