Worked on enhancing the Kazakhstan product catalog within the moysklad/api-remap-1.2-doc repository by introducing NTIN validation for product entities. Developed a dedicated NTIN validation module and updated the product dictionary to enforce correct NTIN length, ensuring compliance with Kazakhstan’s regulatory requirements. This approach focused on strengthening data validation and improving data integrity, reducing the need for manual checks and supporting more reliable downstream processing. The work leveraged skills in API design, data validation, and documentation, primarily using Markdown for technical updates. No critical bugs were addressed during this period, with the main contribution centered on feature development and compliance.