Pretty much the title. Like, get those handheld scanners and attach them to the carts. I scan items as I put them in, roll up to a “register” where the cart is weighed and verified by a cashier. I just hand over the cash then leave. Or even better, install load sensors in the cart.
Usually I like to pack my groceries into my boxes as I get them into the cart. Keeps things orderly and neat and I also don’t buy more than I can carry home. But this means I have to unpack them to place on the belt then pack them all over again after paying. It would be kinda nice to just pay by the cart load.
We have something similar in the UK.
Typically, you need to already be a member of the stores loyalty/rewards scheme, so that they know who you are before you start scanning items. And if anything goes wrong, like you try to rip them off, or a technical issue with the scanner, you get locked out from using the scanners until you call their support line and sort it out.