June 15 : Indian payment gateway services provider Razorpay Software has confidentially filed draft papers for an initial public offering, a newspaper advertisement showed on Monday. The confidential route allows IPO-bound firms to keep their filings private until the launch of the public issue. Financial news publication Moneycontrol on Sunday reported that the proposed issue is expected to raise over $500-$600 million, while The Economic Times in April said that the confidential IPO filing