This document provides a summary of how three major mobile network operators in Indonesia - Telkomsel, Indosat, and XL - implemented mobile money interoperability between their platforms in just six months. The operators recognized that an interconnected mobile money system would allow customers to transfer funds across networks, strengthening the value proposition and increasing competitiveness in Indonesia's growing payments market. With support from new regulations enabling broader agent networks, the CEOs of the three operators began discussions in late 2012 and agreed to prioritize real-time account-to-account transfers across platforms. Each operator maintained technical independence while collaborating at high levels and through cross-functional teams to launch interoperability in May 2013.