Does "ring someone up" sound right in shop?
At a shop, when I put all the products I want to buy on the counter, the shopkeeper said "Let's ring you up."
I searched it up and I found out that the phrase "ring something up" means to record the cost of goods being bought in a shop on a cash register. But the shopkeeper said "ring YOU up" not "ring ITEMS up".
I'm not an item. What exactly does ring someone up mean in this context?
I also found "ring someone up" can mean to telephone someone which also makes no sense.

Question

Answer

Let's ring YOU up is a very old-fashioned, almost archaic, form of saying "let's ring up your purchases". means exactly the same thing as "let's ring up THE PURCHASES".

Answer

It's probably not standard, but it is understandable, it doesn't sound strange, and is short.
They wouldn't have said 'ring items up', but they could have said 'ring your items up'.

Answer

Usually the more common usage of ringing someone up means to call someone on the phone. Eg. I'll ring you later means I'll call you later since a phone goes ring ring haha. However, in this context to 'ring you up' means to total all your purchases at the cash register. This saying originates from back in the old days when phones and cash registers had a bell to make a call or ring up a purchase. I have never experienced someone saying this to me but I guess it depends on what country you are in :)