Twenty-year-old James Fahy is ordering coffee in Twobeans, a coffee shop in Dun Laoghaire, Co Dublin. On the counter near the card payment machine is a neat white box that allows him to tip the barista a euro with a simple tap of his phone. Sitting on the bench outside the café, Fahy tells me that he installed the device just a few weeks earlier. Along with his co-founder Ciara Walsh, also 20, who has joined us for coffee, Fahy has been flat out in recent months rolling out the JustTip machine to coffee shops, delis, sandwich bars, and other…

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