- As mobile devices have been popular, many wireless applications for mobile devices have been developed. One of applications is to represent financial transaction report for a product such as online game. This paper presents the architecture of financial transaction report system of an online game on WAP with J2EE and WML as a case study. The implemented system provides transactional report by filtering the millions of transactions on selected periods. User can analyze the transaction of the game with the reports displayed on his mobile device that is portable and scalable.