Worked on enhancing the reliability of payment extensions in the Shopify/cli repository by implementing schema validation for the Credit Card Payments Extension. Focused on enforcing the presence and boolean type of the supports_moto field to improve data integrity for MOTO (Mail Order Telephone Order) payments. Utilized TypeScript for backend development and incorporated comprehensive testing to verify the new validation rules, ensuring alignment with existing schema frameworks. The approach maintained consistency across the codebase and reduced future maintenance overhead. All changes were traceable through well-documented commits, reflecting a methodical and standards-driven approach to backend development, schema validation, and automated testing.