I implemented a Passwordless connection with SMS, using Embedded Login on React Native.
On a User/Password DB connection, sign up and log in are two distinct API calls. On Passwordless, however, when a user signs in, an Auth0 user is created implicitly if no user previously existed for that phone number.
Is it possible to know whether a Passwordless sign in is a ‘Sign Up’ or a ‘Log in with exisitng user’?
The only solution I could think of was calling the User Management API to see if a user with this phone number exists, but I really want to avoid the additional API call, as well as the privacy and security risks derived from letting pre-authenticated end user pull data about existing users.