Today's world there are huge no.of websites available commercially for online purchases and sales. The customers are doing online transactions by disclosing their bank details more number of times to various commercial websites in unsecured way. This Book mainly describes about how to secure the customers information during online transactions done from various commercial websites. A new framework has been designed by using Radius Protocol to safe guard the details of the customers when they are doing more number of online transactions. By using this framework the customers will disclose their bank details only one time through a common gateway for doing payment. By reading this book the authors can able to analyze and identify the countries in which more number of online transactions are done based on different age groups and able to provide a secure payment gateway.