Financial technology—or fintech—is gaining in popularity globally as a way of making financial services more efficient and accessible. In rapidly developing China, fintech is taking off, catering to markets that state-owned banks and an undersized financial sector do not serve amid a backdrop of growing consumption and a large, tech-savvy millennial generation. It is becoming increasingly likely that some of China’s fintech firms will change the way the world does business.In China’s Fintech...