I just learned about the concept of "universal shopping carts" but I am looking for something simpler: a universal shopping data account?
What I mean is this: users would have an account where they enter their contact information, delivery address information and preferred payment methods once, and then they would be able to allow merchants to take data from that account, so that entering the same information into various online shops would not be necessary.
Think of it like the already existing Linkedin sign-up: you can sign up to various sites with your Linkedin account; a site pulls the personal Linkedin data, so that you do not have to enter it manually. It is quite popular with various recruitment/ job-hunt apps.
Is there something like this for e-commerce?
(At this point I would just like to discover if something like this exists at all; price/ platform compatibility/ etc are not of concern.)