Worked on the Azure/azure-rest-api-specs repository to deliver the Microsoft Code Transparency Service API v0.9 upgrade, focusing on stabilizing the 2026-03-26 contract with new endpoints and SCRAPI v09 alignment. Addressed authentication flows and content-type accuracy, introducing 401 Unauthorized handling and updating response headers to ensure consistent API behavior. Enhanced developer experience by standardizing error handling, retries, and transaction ID header presence. Improved documentation and examples, and regenerated TypeSpec outputs to reflect the stable version. Utilized TypeScript, JSON, and TypeSpec to create a more robust, standards-aligned API that streamlines onboarding and supports reliable integration for downstream consumers.