Tidy Up CustomerService Bean - Spec Alignment, Testing, and Type Safety #87
Description
Problem Context
The CustomerService bean, which serves as a high-level abstraction for the OpenWealth Customer Management APIs, is functionally complete - but needs a final pass to:
- Ensure full alignment with the OpenWealth API specifications
- Improve type safety (e.g., using enums for country codes, status fields, etc.)
- Verify correctness with thorough unit and integration testing
- Improve or finalize developer-facing documentation
Solution
Cross-check and enhance the CustomerService class by:
- Reviewing all parameters, response types, and optional fields for correctness and clarity
- Refactoring any loosely typed parameters (e.g., String values for enum-like fields) to proper enums or typesafe wrappers
- Add unit tests covering both happy paths and edge cases