It's usually easier to use an Android emulator like GenyMotion or a rooted Android phone and use HTTPToolkit and/or some certificate bypassing method using Frida or other and then explore APIs through their official apps.

I've scraped loads of stuff through unofficial APIs before this way. Most developers don't ever expect people to do this so they're often a bit less secure too.

Alternatively sometimes doing a Global GitHub / Sourcegraph search you might find someone else who's done the hard work to reverse engineer an API and open-sourced it.