After researching best options for in-app feedback services, some suggested Parse, or Helpstack.io or InstaBug - I'd rather stick with Firebase because it's already installed, so please do not recommend those unless there is no other way.
Thanks,
VXP
While Firebase In-App Messaging is an effective way for customizing messages and reaching out to users. It does not provide a communication channel for chatting with users.
I would recommend Instabug's in-app chat. Your users will reach you through a shake gesture (pop-up appearing upon shake found below) or other customizable gestures. You could then reach out to that user for whatever reason, e.g., asking for more feedback or letting them know their issue's been fixed.
You could get notified on Firebase instantly by integrating Instabug with Zapier if you would like to streamline your workflow on Firebase.
Here's their in-app chat page. It's pretty easy to integrate the SDK, takes a line of code.
For full disclosure, I work at Instabug. Let me know if there is anything I can do for you.