Web API – A Solid Approach
https://www.codeproject.com/Articles/1066348/Web-API-A-Solid-Approach
https://www.codeproject.com/Articles/1022462/Error-Handling-in-SOLID-Csharp-NET-The-Operation-R
https://www.codeproject.com/Articles/730191/Lightweight-Domain-Services-Library
https://www.codeproject.com/Articles/703634/SOLID-architecture-principles-using-simple-Csharp
Simple OAuth2 Authorization Server with Identity Server and .NET Core
https://www.codeproject.com/Articles/1183421/Simple-OAuth-Authorization-Server-with-Identity-Se
https://www.codeproject.com/Articles/1171546/OAuth-Authorization-flows-explained-with-examples
OAuth2
https://damienbod.com/2015/11/08/oauth2-implicit-flow-with-angular-and-asp-net-5-identity-server/
https://stackoverflow.com/questions/37309986/identity-server-4-authorization-code-flow-example
OAuth2Login
https://www.codeproject.com/Articles/1006013/OAuth-Social-Logins-Facebook-Google-Twitter-PayPal
https://github.com/lepipele/OAuth2Login
