I've collected some info of Gather API calls the Android app could use to
sync saved pages. This could be extended for general collections and watch
lists later.
There are some features missing from the Gather API and deployments to
other wikis besides en and he WP. See my comments on
https://phabricator.wikimedia.org/T123377 for details. Add your own
comments if you have ideas for improvement or can help fix any of the
current limitations of the API.
Thanks,
Bernd