Wal-Mart has added its mobile self-checkout option at 40 Denver-area stores, after launching the first tests of the "scan-and-go" system at stores in four other markets. Shoppers use their smartphones to scan each product's bar code as they fill their carts, then the application generates a QR code that's scanned at self-payment kiosks.
Wal-Mart extends "scan-and-go" option to more stores
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