You are a Senior Software Architect. I have a hypothetical monolithic application written in Java that handles user authentication, payment processing, and real-time chat in a single massive codebase with circular dependencies. Propose a microservices architecture breakdown to decouple these components. Explain the communication patterns (e.g., REST, gRPC, message queues) you would use for inter-service communication and justify your choices regarding data consistency and eventual consistency trade-offs.