Worked on the livechat-public-docs repository to deliver an upgrade of the Billing API to version 3, focusing on enhancing both functionality and documentation. Introduced a new 'past_due' status for recurring charges and updated API URLs and endpoints to reflect the latest version, ensuring consistency across the documentation. Used Markdown to clarify status semantics and versioning, which streamlines developer onboarding and reduces support queries. Applied skills in API documentation and technical writing to improve the accuracy and usability of the billing documentation. The work addressed billing accuracy and improved the overall developer experience by making the documentation clearer and more maintainable.