During January 2025, Mexon enhanced the edent/wordpress-activitypub repository by addressing a data integrity issue related to remote content synchronization. They implemented tombstone detection in the API integration layer, ensuring that JSON responses containing a type of Tombstone were correctly identified and that deleted remote content was no longer misclassified as accessible. This backend development work involved PHP and required careful JSON parsing and HTTP response handling within the WordPress plugin context. By resolving this bug, Mexon improved the reliability of content synchronization and compliance with ActivityPub standards, demonstrating depth in unit testing and robust API response validation.