During April 2025, Lang focused on enhancing the openfga/sdk-generator repository by developing a robust OAuth2 client integration. He implemented dynamic token URL construction and issuer parsing, introducing a parse_issuer method to reliably derive token endpoints from various issuer formats. This approach addressed the challenge of supporting diverse OAuth2 issuer environments and reduced the risk of misconfiguration. Lang wrote comprehensive unit tests to validate token endpoint resolution, ensuring the reliability of OAuth2 flows. His work leveraged Python and Mustache, emphasizing API integration and backend development, and resulted in a maintainable, minimal-surface-area solution for dynamic issuer handling in the Python client.