Worked on the alphagov/pay-connector repository to deliver a focused refactor that removed the deprecated NotificationCredentials feature from the codebase. This involved eliminating the NotificationCredentials entity, updating the OpenAPI specification, and cleaning up related imports and methods to streamline data access. The approach included careful adjustment of database migrations and thorough codebase review to ensure consistency and maintainability. Using Java and YAML, the developer applied skills in API design, backend development, and database management to simplify the data model. This work reduced technical debt, aligned the API with current requirements, and made ongoing maintenance more straightforward for the team.