Multi-factor authentication (also known as two-factor authentication) is an extra layer of protection used to ensure online accounts' security beyond just emails and passwords. In addition to your password, you'll also need a code generated by the Google Authenticator app on your phone.
Considering the pluggable architecture of nopCommerce, it can also be easily extended to support verification by email or SMS.
Installation instructions:
Please find more informartion about how to install plugins here.