User Profile Integration with external Database

Hello

I have a wordpress site that I am about to open to users for signup and profile management but I also have an external database that i would like updated with new users everytime they sign up via wordpress. Is this possible?

I would also like the external database to send information to a users profile everytime they login.

What im trying to do is start a loyalty program where users can sign up and track their loyalty points via the website. Points will be earned in our brick and mortar store and entered via the stores POS database.