I’ve also previously commented on this feature request here.
This thread has been closed as it started over four years ago, and has taken various different directions since then.
You’re welcome to follow our developer platform roadmap, and to offer feedback on that. There’s no current plan for a conversation API at this time. Our blog post from April discusses the current focus of the API and platform, oriented towards data and customer service features rather than towards specific mapping of every client app feature into an API.
As always, we appreciate your interest and work with our API and platform, and we are listening!