We are in the process of developing a nopCommerce site which connects to an existing ERP system. Since the ERP is already connected to several client applications ( mobile app, web sites ), we want to allow users to use the same credentials to login to nopCommerce site as well. Passwords are currently stored as MD-5 hashes in the ERP, so I think migrating them into nopCommerce is not an options. However we are in a position to expose an OAuth server for authentication. Is there any module/plugin that allows us to use an external OAuth server for verification? or is there a better alternative to achieve this goal?

Thank you.
Paul :)