Have you ever logged into a website using your Google or Facebook account? Or connected an app to access your GitHub data? If so, you’ve already used OAuth2, whether you knew it or not. OAuth2 is the world’s most popular, extensible authorization framework. It allows you to integrate a couple of systems together by delegating access to your data from one service to another. But here is the thing - most people don’t really understand how OAuth2 really works. Personally, I’ve implemented several a...