The SendBird Chat Unity Sample Code by SendBird demonstrates how to interact with the API, providing an example with user interface. Three features available include open chat, one on one messaging, and group messaging.
Message Bus is a cloud-native application service for email and mobile messaging. The selling point is the high deliverability rate, its ability to scale according to demand and the fact that it's simple enough to be used by developers with limited time and resources. The Message Bus API makes it possible for developers to easily add messaging functionality to their websites and apps.