To achieve this ambitious goal, we employed a multi-faceted strategy that involved meticulous planning, cutting-edge technology, and a deep understanding of the complexities of global commerce. We designed a distributed microservices architecture using Java and Ruby, with a React-based merchant dashboard for real-time transaction monitoring. We ensured regulatory compliance across multiple jurisdictions, incorporating automated compliance checks and transaction screening. We built the system, leveraging event-driven architecture, message queues, and sharded PostgreSQL clusters for horizontal scaling. And then, we rolled out the system in phases, starting with a small pilot group and gradually scaling up to meet the demands of a global user base.