Like a barcode? Effectively every product in grocery stores has a UPC on it already. So you wouldn't need store buy-in, because the challenge here isn't the QR

Like a barcode? Effectively every product in grocery stores has a UPC on it already. So you wouldn't need store buy-in, because the challenge here isn't the QR code, it's the place where all that data is maintained. An app could scan the barcode, or you could manually enter the UPC into a website. If you think this is worthwhile, you could build this.