Worked on the Shopify/cli repository to enhance Payments App Extensions by introducing optional capability fields within Zod schemas for base, custom onsite, and offsite payment configurations. This update allowed specific boolean flags to be omitted from configurations without causing parsing failures, thereby improving extensibility and reducing configuration errors. The approach involved modifying TypeScript code to adjust schema definitions and expanding unit tests to ensure robust parsing when fields are absent. By aligning documentation and test coverage with these changes, the work supported ongoing configurability and reliability for payments app extensions, leveraging skills in TypeScript, Zod, and unit testing throughout the process.