MPAY Fintech Platform on Azure demonstrates a highly available, multi-tier enterprise architecture spanning two availability zones with WAF-protected ingress, API Management, and resilient microservices. Traffic flows from retail users and merchants through Azure Front Door and Application Gateway WAF v2 to MPAY Core instances, Service Bus, and Event Grid for asynchronous processing across AKS and Container Apps. The data tier ensures transactional consistency with Azure SQL primary-replica failover, Cosmos DB ledger, Redis caching, and centralized Key Vault secrets management. This architecture exemplifies Azure best practices for financial services: defense-in-depth security, geographic redundancy, event-driven workflows, and comprehensive monitoring via Azure Monitor.