Messaging extensions (or compose extensions as they were previously called) are a compelling way to interact with our end users inside Microsoft Teams. They can be very straightforward and straightforward or very complex. Under the covers, it still are web services so, how do we create these web services to incorporate our use cases inside of Teams. When we add another layer of authentication, how would that affect the experience? In this session, we will dive under the surface of extensions and see how they work and how we can adjust them to our needs