During March 2025, Chen Gao enhanced developer-facing documentation for the amzn/selling-partner-api-samples repository, focusing on the Auth Lifecycle Management use case. Chen used Markdown and technical writing skills to deliver comprehensive README updates that clarified tenant definitions, authorization flows, audience scope, and OAuth initiation points for both Website and App Store integrations. The documentation improvements addressed onboarding challenges by reducing ambiguity and aligning guidance with current authentication lifecycle patterns. Through five targeted commits, Chen ensured that integration paths were clearly documented, enabling faster developer adoption and reducing support needs. The work demonstrated depth in both technical communication and documentation structure.