Bangalore-headquartered Razorpay, one of the handful of Indian fintech startups that has demonstrated accelerated growth in recent years, has joined the coveted unicorn club after raising $100 million in a new financing round, the payments processing startup said on Monday. The new financing round, a Series D, was co-led by Singapore’s sovereign wealth fund GIC and Sequoia India, the six-year-old Indian startup said. The new round valued the startup at “a little more than $1 billion,” co-founder and chief executive Harshil Mathur told TechCrunch in an interview. Existing investors Ribbit…