Late last year, Australia Post paid A$48 million to buy Securepay, the largest independent payment gateway business, according to an article in The eCommerce Report.SecurePay has rolled out a series of payment gateway businesses over the last decade, including eSec, Direct One and Camtech.It says it processes 50 million billing and payment transactions a year, by securely handling credit and debit card payments - mostly from websites - and by passing the payment instructions and confirmation to and from banks.Australia Post did not disclose the price paid in announcing the deal in late 2010. The revenues and profits of SecurePay are also not public knowledge.However, Advent Private Capital, the controlling shareholder in SecurePay before the sale, has since told investors in its Advent III fund that the sale price represented a 6.2 multiple on its investment.