Additional Resources
DrupalCon Portland (OG and The Message Stack)
Drupal 8 Message Stack documentation
Introduction
Message Module
The Message module provides the core of the message stack. It provides a message entity type that can be subtyped into one or more message
Message Notify Module
The Message Notify module extends the Message module by providing a system for forwarding messages. The module uses a plugin system to
Message Subscribe Module
The Message Subscribe module provides a mechanism for users to tell the system to send them notification messages when events occur on a web
Use Cases
There are three main use cases for the message stack:

