I've reached a very high point of desperation. I've completed 99% of the app, and I'm only missing the implementation of Apple Sign In. I managed to do it with Google, but Apple's is proving impossible. There are no tutorials online, and the ones that exist are 3 years old. In forums, I read that Apple's OAuth doesn't work well with Supabase and FF. They say it's better to use Firebase since it does work there. Honestly, I've reached a point where I don't know what to do. The option of downloading the code and uploading it directly to the stores is not viable.
If someone could help me, I would appreciate it.