After conducting a mobile payments trial in France last year, McDonald's said it will integrate the system into all of its in-store ordering machines by the end of the year. The service lets customers use the McDonald's mobile app or its website to order and pay through PayPal, then pick up their food in a dedicated line to reduce wait time.

France is McDonald's second most profitable market, according to the French startup blog RudeBaguette, which may explain why the fast-food giant has chosen that country to work out its mobile strategy before rolling it out elsewhere.

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