A Chinese businessman arrives in Singapore to attend a conference. At the airport, he hops into a taxi to get to his hotel. And he pays for the fare using Alipay, the world's largest mobile payment platform with over half a billion users, most of whom are Chinese nationals.
An instantaneous cashless transfer from his bank in China to the vendor, CityCab, in Singapore. No fuss, no sweat. Welcome to the world of e-payment interoperability.