Build a Secure .NET Web API With Token Authentication

API security is complex, and just because you’ve built an API that you want to make public, doesn’t always mean you want it to be accessible to anyone. Most developers are looking for fine-grained control over who can access their APIs, but setting up that kind of user management can be a daunting task. Not only do you have to create your own authorization service that can create API credentials for your users, you also have to build the functionality to exchange those API credentials for an access token using OAuth 2.0. Happily, Okta can make this simple. With just a few lines of code, Okta handles all the complicated and time-consuming security elements and frees you up to concentrate on creating a stellar API.
Understand the Basic Flow
When handling authentication for a server-to-server API, you really only have two options: HTTP basic auth or OAuth 2.0 client credentials.