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 to ensure consistent policy handling across services. He designed and implemented a versioned JSON Schema, integrating validation hooks and aligning required fields to improve data integrity. His work involved data modeling and schema definition using JSON, with changes applied across the registry and related tooling to support production rollout. Over the course of the month, Andreas delivered a robust foundation for standardized refund policy management, demonstrating depth in schema design and attention to cross-platform validation requirements.