Worked on the centrapay-docs repository to enhance both data modeling and developer documentation over a two-month period. Delivered a targeted data model update by introducing a promotionId field to the promotion membership model, clarifying relationships between promotions and memberships for improved analytics and reporting. Subsequently, focused on expanding developer resources by documenting the new Applet API, including its model definition and a create-applet endpoint, and updated API navigation to improve discoverability. All changes were implemented using JavaScript and Markdown, with an emphasis on API development and clear documentation to support downstream analytics and facilitate onboarding for other developers.