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When designing a software system that needs to deal with federated identities, OAuth 2.0 and OpenID Connect are some of the best options at your disposal. In this quickstart guide, I’m going to explain what OAuth 2.0 and OpenID Connect are about. Then I will guide you into choosing the right authentication/authorization flow for your applications. OAuth 2.0 OAuth 2.0 is an open framework that allows to securely obtain authorization to access resources via HTTP. For example, you can tell Google t...