In this recipe, we saw server-side authentication. There are other authentication flow use cases, including server-side authentication flow, client-side authentication flow, and custom authentication flow. We will look at some of these in later recipes. 

In the real world, the admin APIs that we used for authentication in this recipe are mostly used along with SDKs, for server-side languages like Java, Node.js, and so on. We can refer to the respective SDK documentation and follow the API usages in this recipe to implement them using the SDK.