Sms Provider For Two-factor authentication

Xem tại đây: https://docs.microsoft.com/en-us/aspnet/identity/overview/features-api/two-factor-authentication-using-sms-and-email-with-aspnet-identity

AspSMS: https://www.aspsms.com/asp.net/identity/testcredits/

Twilio: https://www.twilio.com/try-twilio