After you enable two-factor authentication (2FA), you can require users and admins to configure it the next time that they log in to WHMCS.
Facebook® Sign-In Integrations let your customers register, sign in, and connect with your WHMCS installation.
Google® Sign-In Integrations let your customers register, sign in, and connect with your WHMCS installation.
Twitter™ Sign-In Integrations let your customers register, sign in, and connect with your WHMCS installation.