Cash may be king in India, but with smartphone usage heading toward 1 billion, online payments are catching up. Digital transactions doubled in the last two years, faster than any major country outside China, and are forecast to reach $2 trillion in 2023. Such exponential growth hasn’t been trouble-free, however, leading to concern about the wisdom of relying on a single payments system. That has global tech giants including Amazon, Facebook and Google lining up for the chance to build a new pla

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