McDonald's is testing PayPal's mobile payment services in France, in a move that could see Paypal as the mobile payment platform of choice at one of the world's largest fast food chains. Reuters reports that the trials span across thirty restaurants. Customers can order food online or on a mobile phone app, and then pick up their meal in a separate, dedicated lane. PayPal has had some luck with retail partnerships, but a deal with McDonald's would be be valuable, in light of the restaurant's 30,000 locations. It might also help to stave off their rival Square's rapid ascent: Square recently partnered with Starbucks, which will bring the company's mobile payment solution to the coffee magnate's 7,000 locations this fall.