The world's biggest retailer said that employees have been testing the Scan and Go service at one store in Arkansas. The new system may cut the time it takes shoppers to scan items but does not allow customers to pay for their purchases via smartphone.

The service has not yet been rolled out to shoppers, but Wal-Mart sent employees e-mails this week offering $100 and a $25 Wal-Mart gift card if they went to a supercenter near the retailer's headquarters in Bentonville, Ark., to test out the service. The company said it wanted to get comments from "real people on whether this new system is user-friendly."

The Wall Street Journal first reported Wal-Mart's plans.

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