The Leap Card, introduced by Ireland's National Transport Authority (NTA) in 2011, has expanded to support over 130 million journeys annually and includes more than 2.3 million cards in circulation. Challenges in reloading credits led the NTA to innovate with mobile phone integration using NXP's MIFARE DESFire EV1 technology, resulting in a successful mobile app launch that achieved significant user engagement and revenue growth within just eight months. This new system enabled cost-effective expansion and improved customer experience by facilitating convenient mobile top-ups and transactions.