In 2011, when Krish Subramanian decided to quit his technology specialist job with Cognizant to launch his own venture, he persuaded two friends, Rajaraman Santhanam and T Thiyagarajan, to take the plunge as well. Their common mentor at Chennai-based product company Zoho, KP Saravanan, spent long hours persuading the duo to reconsider their decision — only to chuck his job and join as the fourth co-founder. The idea that so excited these four may sound rather simple — a service that helps companies manage their online subscription billings — but ChargeBee has already proved itself a winner. The Chennai-based start-up now has over 500 customers, processes over $2 million worth of their customers’ transactions every month and has even managed to raise $1.17 million in funding. With the world moving to a subscription-based economy and more consumers transacting online, the party has just started for ChargeBee.