Auth0 Passwordless Authentication
https://medium.com/@email_36494/auth0-passwordless-passwordless-authentication-how-to-do-it-a32495760a3b
OAuth Authentication Issues
https://medium.com/a-bugz-life/the-wondeful-world-of-oauth-bug-bounty-edition-af3073b354c1 https://book.hacktricks.xyz/pentesting-web/oauth-to-account-takeover