How to implement authorization by token in .net core?

Question

ASP.NET

There is a front on angular 2, there is a back on .net core. It is necessary to implement authorization by token, through third-party sites like VK. after which all communication between the back and the front must be done through the token. tell me how to implement

Answer 1

Well, you make a database into which you enter the token, and when you access the back, you check the token in the database, if there is one, you give an answer, if not, send away