(Bloomberg) -- Wal-Mart Stores Inc. is expanding its mobile-payment system across the U.S., adding convenience for shoppers and giving the world’s biggest retailer new data on its customers’ shopping habits.

The Walmart Pay feature on its app -- available on Apple and Android devices -- can now be used at all 4,600 U.S. stores, the Bentonville, Arkansas-based company said Wednesday in a statement. Wal-Mart said more than 20 million people regularly use its app, which also provides discounts and helps shoppers locate items within stores.

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