I need to implement external logins and had no problem with Facebook and Google since they are supported but I'm stuck at LinkedIn. I am not exactly a beginner but I'm not very experienced at this either. Prior to this post I viewed a thousand explanations and most of them were vague, others just didn't work and others were explained for advanced people.
What I've tried:
-using cookies in the Configure method, but the methods were deprecated (I figured they were not for the 2.0 version). I also tried app.UseLinkedInAuthentication(...) from Microsoft.AspNetCore.Authentication.LinkedIn to no success.
-writing a service in ConfigureServices (but I didn't get it to work, I assume this is where I need to do it). I also tried this but they were talking like they knew what they were doing.
So to keep this simple, I made a default MVC ASP.NET Core 2.0 application in Visual Studio 2017. All I need to do is write stuff in Startup.cs, so my question is, what is it that I have to write and why? Thank you very much in advance.
PS: I would appreciate an explanation in the comment, if it's a link I probably already visited it :)