Visa is transforming its infrastructure to be more open and software-defined to support continued growth in digital payments and new technologies. It aims to have the highest availability and security for billions of users through a separation of hardware and software using open standards. Visa is migrating its data centers and wide area network (WAN) to use software-defined networking (SDN) and network functions virtualization (NFV) to gain more flexibility, visibility and control over its infrastructure. Careful planning is needed for the phased migration to the new software-defined infrastructure.