Worked on the Open-Pix/openpix-developers repository to deliver the OpenPix API v2, introducing endpoints for managing installments, subscriptions, and payments, as well as static Pix QR code management. Focused on API development and documentation, the work included a comprehensive refactor of the API surface to streamline partner integration and support future extensibility. Updated the Installment schema and refreshed the OpenAPI Specification and YAML-based documentation to clarify new structures and capabilities. These enhancements enabled more efficient merchant onboarding and richer payment flows, while providing clearer API contracts for external partners and improving the overall maintainability of the API platform.