Alexis Mora Sanchez enhanced the internxt/sdk repository by laying the architectural groundwork for integrating Cleaner service features into the payment tier system. Focusing on maintainability and future extensibility, Alexis introduced the CleanerFeatures interface and expanded the Service enum within the Tier type definition using TypeScript. This update ensures that cleaner-related features can be seamlessly supported in future billing enhancements while maintaining backward compatibility. The work centered on type definitions and software development best practices, addressing backlog item #321 as a maintenance chore. Although the contribution was foundational, it provided a robust structure for future development without introducing immediate user-facing changes.