The tap-to-pay support will be limited to select stores at launch, but will be extended to all Walmart and Sam's Club locations by the end of the year.

Walmart and other big U.S. retailers have warned that consumers were being cautious, even if personal balance sheets seemed healthy.

Walmart shoppers will soon have a faster way to check out at the register. Starting next week, the retail giant will roll out tap-to-pay at select Walmart stores and Sam’s Club locations across the United States.