“where they bring the product to the front after you have paid for it”
Never heard of that.
It’s how it used to be done.
Right until the 1980’s there was a store by my grandfathers in Lac La Nonne that operated like that.
https://i.pinimg.com/originals/4f/d0/38/4fd0381e0f8639fe159c6aaf2deb342a.jpg