This white paper focused on how enterprises can modernize legacy environments using API-driven integration, governance, and AI without performing risky full-system migrations. It explained how organizations across banking, insurance, and transportation industries use integration fabrics and orchestration layers to connect legacy mainframes with modern cloud applications, analytics platforms, and AI services. The paper emphasized that modernization success depends on disciplined integration strategies rather than replacing stable core systems. It also explored how vendor-agnostic architectures, governed APIs, observability, and real-time data access improve agility, compliance, scalability, and operational resilience. Through multiple case studies, the paper demonstrated how integration-led

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