As of iOS 10, the messages app is going to have a separate, in-app App Store for Messages App Extensions.
* How should app developers package and distribute their app extensions to appear in this app store?
* Do we need to create a separate "app" in iTunes Connect? If so, will these "app extension-only apps" also show up in the regular app store?
* It's possible to bundle Messages app extensions within a "normal" iOS app. Will Messages app extensions bundled in this way show up in the "Messages" app store?
* If we distribute our Messages app extension through both distribution mechanism (ie. bundled with a normal iOS app AND as a separate app for the Messages app store, should both copies of our Messages app extension use the same app bundle id?
* If a user installs our Messages app extension through the Messages app store AND installs our normal app (which includes our Messages app extension in its bundle), will the app extension show up twice in Messages? Will these two copies be upgraded separately?
I can't find any documentation that answers these questions.