Modern payment gateway architecture, sleek metal framework, futuristic neon lights, complex circuit boards, rows of servers, high-performance computers, fiber optic cables, virtual private network, secure firewalls, encryption algorithms, digital certificates, secure sockets layer, asymmetric cryptography, elliptic curve cryptography, payment terminals, swipe machines, card readers, contactless payment symbols, e-commerce website integration, mobile app transactions, cloud infrastructure, real-time analytics dashboard, monitoring systems, high-availability clustering, load balancers, scalable architecture, microservices design, DevOps practices, agile development methodologies, CI/CD pipelines.