Facebook and Google chase a new trillion-dollar payments market in India

India saw a brief spurt in digital payments two years ago when Prime Minister Narendra Modi's government banned most of the nation's existing bank notes

Surendrasingh Sucharia always has a few thousand rupees in his pocket, but can’t recall the last time he used cash. The 29-year-old product manager in Bangalore uses a string of smartphone apps including ones from Google and India’s Paytm to pay for everything from $40 bags of groceries to street food that costs pennies.

A bewildering array of digital payment businesses from global names like Facebook Inc.’s WhatsApp to Google are in a slugfest to win Indian users. Warren Buffett’s Berkshire Hathaway Inc. is acquiring a stake in the company behind payments leader Paytm.

Meanwhile, a string of other big-name players are