What ways are there to store information about an anonymous/guest user in a database?

Question

Our application has an online shop among other features, and users are normally requested to register before completing a sale, creating a unique customer_ID in the

Answer 1

Ofcourse you can track the sale session by using cookies. but Also register anonymous users to your site but don't let them realize that they are filling any registration form .Let them follow the sale process and at the end of the sale process generate a unique customer id and email them and also display that notification on the site after they complete their sale and make them login into the site by just entering their customer id.