OSEM is an event management app tailored to Free Software Conferences. OSEM already has a feature to sell conference tickets to its attendees. At the moment the user has to buy the ticket online and pay on arrival at the conference. OSEM currently lacks the ability for a user to pay for its tickets as per their convenience. In this project, we aim to fill this gap in functionality by adding online ticket payment feature. This will improve user experience by making the ticket purchase workflow smoother.