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Is multi factor authentication possible to setup with the fuel login? Is it possible to override the login and user modules / controllers to install a MFA setup?
Multi-factor authentication is not a built-in capability of FUEL.
Is it possible to extend / override fuel controllers so I can rework the login logic and implement MFA?
You can certainly try to do that by creating perhaps a separate login that uses multi-factor authentication and then creates a validated session for FUEL. It's built on top of CI so you can leverage that as much as you need.
never mind - believe i was able to get this accomplished. thanks.