Worked on the edent/wordpress-activitypub repository to enhance data integrity by addressing a bug in API response handling. Focused on backend development using PHP, the work involved implementing logic to detect tombstone objects within JSON payloads returned by remote ActivityPub servers. By inspecting the HTTP response body for a specific 'type' field set to 'Tombstone', the update ensured that deleted remote content was no longer misclassified as accessible. This fix improved synchronization reliability and compliance with ActivityPub standards. The approach demonstrated skills in API integration, unit testing, and debugging at the HTTP layer within a WordPress plugin context.