Developed and delivered a new Interchange Fee Details Structure for tiered customer convenience fee calculations in the SetuHQ/docs repository, focusing on enhancing payment processing flexibility and accuracy. The work involved updating the interchangefeedetailsV2 structure using JSON, enabling dynamic fee logic based on transaction amounts. Changes were carefully cherry-picked from previous commits to maintain feature continuity and ensure robust version control. Emphasis was placed on aligning documentation with the new API structure, improving traceability and clarity for future development. This contribution demonstrates proficiency in API development, payment domain logic, and disciplined code management, with a primary focus on feature delivery and maintainability.