Developed and delivered a new JSON schema for Worldline TAPI v1, integrating it into the extenda/hiiretail-json-schema-registry to support validated and versioned data exchange within the HiIconnect ecosystem. Focused on schema definition using JSON, the work established a foundation for future schema evolution and improved governance across the registry. The implementation provided end-to-end traceability from ticket to code, referencing explicit commits for transparency. No critical bugs were addressed during this period, as the primary focus remained on feature delivery and enhancing schema management practices. This contribution enables safer integration and streamlined onboarding for downstream services relying on schema validation.