Resolve OpenCart Deprecated PHP Warnings

My OpenCart shop’s core has started flooding the error log with three recurring problems: • deprecated functions • outdated PHP-version warnings • deprecated class usage Because the errors sit inside core functionality, they risk slowing the site and exposing security gaps. I need a developer who knows OpenCart inside out to clean up the codebase, silence the warnings the right way (no error-suppression hacks), and leave every storefront feature working exactly as before. What I expect once you are done is simple: noticeably faster page loads and the peace of mind that the store is running on a tighter, more secure foundation. Typical tasks will include tracing the log entries back to the offending files, refactoring or replacing the legacy calls, testing against the current PHP version, and confirming there are no ripple effects on checkout, admin, or any existing extensions. Please outline your approach, the tools you prefer for version control and staging, and an estimated timeline for completion. I will grant server access and provide a fresh backup before you start.