ASP.net core web api: Using Facebook/Google OAuth access token for authentication

Question

For serveral days now I am trying to get OAuth authentication with Google and Facebook to work within my ASP.net core web api project.

my current status is:

Answer 1

You have to copy the custom code available in this article on medium

Creat a function in AccountController.cs

 private async Task AuthenticationManager_GetExternalLoginInfoAsync_WithExternalBearer()

And paste the code given in the article