How can I connect my chat app to Shopify inbox?

[Vadimk]

I have a chat application for Shopify websites and I would like to integrate it with Shopify inbox.
I couldn't find the docs for it, is it even possible? 

My goal is to connect my chat to Shopify inbox so the messages from the chat will appear there.
Ideally, I would like to establish 2 way communication through my chat, but just sending the messages from my chat to Shopify inbox would be a good start.

[concman]

I'm experiencing the same problem. I've searched across web regarding the implementation steps, but couldn't find at all. Some of the devs said that, they integrate Inbox, through partner dashboard -> apps -> extensions, but when I open the same page, it returns null.

I think Shopify should reopen this integration to make the commerce better for everyone.