In this repo, all of these features related to Asp.Net core Identity have been implemented and a JWT token has been used to authenticate a user. Furthermore, to enforce external login, Google firebase has been used inside a react js application and based on the token that firebase generated, external authentication has been implemented. There is a text version explaining the whole process required to implement this kind of authentication inside the Medium. Furthermore, there is a Video version too to watch these processes.

https://medium.com/@vahidalizadeh1990/complete-guide-authentication-using-asp-net-core-identity-and-jwt-token-in-the-net-core-api-cd3a291e5c82

https://youtu.be/RT1zMc0X4MQ