Abstract: Detection of fraud in e-commerce payment system or An effective fraud detection system using mining technique is some more related to Mobile computing. Usage of credit card has increased. As we know credit card has become the most popular mode of payment. Customers can easily purchase goods through online. All amounts is credited or debited through credit card. Online banking is also provided for customers to enable them to easily debit, credit or transfer their amount. Whenever a new customer joins, the administrator check the details provided by the customer and send a mail to the customer giving permission for him/her to access the account.