In this video, Matthijs Hoekstra explains how developers can use the Microsoft identity platform to implement authorization that protects APIs.

Code samples for Microsoft identity platform: https://aka.ms/DevTrainingSeries/Samples
Documentation for Microsoft identity platform: https://aka.ms/DevTrainingSeries/Docs

The basics of protecting an API 0:31
Using the Azure portal to setup protection of APIs - 3:42
Using and validating access tokens - 7:00
Enabling application permissions - 9:48
Demo: validating access tokens - 12:50
Why do you need custom validation behavior? - 19:06
Determining effective permissions in your code - 20:58
Example access tokens from different authentication scenarios - 25:55
APIs calling APIs: "on behalf of" flow - 29:26