Private-equity firm Accel-KKR just bought a majority stake in Recurly, a subscription payments company that helps brands like CBS, Showtime, and Twitch manage their revenues. The subscription economy has grown over the last decade, with more businesses looking to recurring revenue models as opposed to relying on one-time sales. In June, Recurly saw a 210% increase in sales year-over-year. Visit Business Insider's homepage for more stories. Recurly, the payments platform for over 2,000 subscription businesses like CBS, Showtime, and Twitch, just received a majority equity investment from tech-focused private-equity firm Accel-KKR.