Suggestions on using this lib with non-web apps

[wong2]

I'm using this library with my Remix application, and it works great. We have both SSR pages and API routes with JSON response.
Now the problem is we're starting to build a mobile app with React Native, and hope to be able to reuse these API routes.
I've read the document of using Supabase Auth with React Native, but it doesn't mention how to interact with a custom backend API.
I hope to get some advice on this.