Worked on the opencart/opencart repository to implement compatibility with PHP 8.5 by refactoring the codebase to remove deprecated curl_close() calls. This update involved making targeted changes across multiple modules, including promotion, marketplace, notification, subscription, order processing, and upgrade tooling. Using PHP and backend development skills, the developer consolidated curl handling improvements within system libraries and related components. The approach ensured that all affected modules operated reliably under PHP 8.5, reducing potential runtime errors and simplifying future maintenance. This work strengthened the upgrade path for merchants and improved the overall reliability of the platform in modern PHP environments.