Andreas Wohlers developed the Refund Rules Schema Standardization (Version 1) for the extenda/hiiretail-json-schema-registry repository, focusing on structured and validated refund configurations. He designed and implemented a JSON Schema that enforces consistent policy handling across services, integrating validation hooks and versioned schema artifacts to support production readiness. His work involved detailed data modeling and schema definition, ensuring required fields were properly aligned to improve data integrity. By applying these changes throughout the registry and related tooling, Andreas enabled a more robust and maintainable approach to refund policy management, leveraging his expertise in JSON and schema validation within a short timeframe.