> Credit card networks already know everything you buy

I didn’t know this.

Let’s say I buy advil, condoms, and dish soap with my capital one Visa card at Walgreens. What information does Walgreens share with visa and/or capital one? I just assumed the name of merchant and the total amount charged was all they needed?

I remember back when I was younger, I’d often see adults requesting the cashier to charge this much on one card, this much on another, bringing out four or five cards. Do all these banks/ card processors get a full list of items sold?