Hello,

I'm the author of a popular plugin, which provides integration of JetBrains IDEs with Bitbucket:
https://plugins.jetbrains.com/plugin/13538-bitbucket-pull-requests

In particular we support commenting, where we show user mentions after a user types @, so we need some API endpoint to do it. Currently we use "https://api.bitbucket.org/internal/repositories/.../.../pr-authors" endpoint, but:

1. It's not officially available (internal)
2. I gives us only a limited list of users, but mention list contains much more users in the web interface.

We also tried to use ".../workspaces/.../members" endpoint, but it only works for admins. By the way a possible solution could be making ".../workspaces/.../members" working for non-admin users (if it's possible in terms of security).