He was repeatedly stopped by burly security guards near the prime minister’s official residence on Delhi’s Lok Kalyan Marg (at the time called Race Course Road) and grilled about why he was in the neighbourhood. His frequent visits to the Bharat Petroleum station nearby had raised suspicion. It took a lot of reasoning and a bit of charm for him to convince the guards posted there that he was getting in on the ground floor of the technology that would transform how consumers bought and businesses sold things in future.