More than 1.32 crore people registered for COVID-19 vaccination on Wednesday as the government's portal, Co-WIN, opened for registration for all citizens above 18 years of age. "Kudos to Team CoWin for building a truly scalable and robust platform. Handling more than 50000 API calls per second is mammoth!!" Aarogya Setu, the government's mobile application for contact tracing tweeted.