American Express Co. continues its move into a payments arena not often associated with the affluent customers served through the New York-based card network. It now accepts Amex card payments at gas stations commonly located in parking lots near Walmart stores.

American Express and Murphy Oil USA Inc., an international oil and gas company, have entered an agreement that enables customers to use the American Express card to pay for fuel at more than 1,100 stations in 23 states, the companies announced Dec. 19.

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