Fix WooCommerce Variation Errors

My WooCommerce store throws either a 500 Internal Server Error or a 403 “Failed to load resource” whenever a shopper selects a product variation (size, type, etc.). Sales have stalled, so I need this fixed quickly and cleanly.

Here’s how I’d like to work together:

1. I will send you a full copy of the site (code + database dump).
2. You will spin it up locally in XAMPP, replicate the error, and track down the root cause.
3. Once you have a stable fix, you’ll document the changes and show me the working variation selector on your local setup before I deploy it to production.

Please tell me:
• The steps you would take to pinpoint and resolve the issue (mention any preferred tools such as Query Monitor, WP-CLI, error-log readers, or browser dev tools).
• An estimated timeline from setup to final hand-off.
• A brief summary of previous WooCommerce or general WordPress debugging you’ve handled, especially 500/403 issues.

Deliverables:
• Clean, commented code or configuration changes that eliminate the errors.
• A short report outlining the cause, the fix, and any preventive recommendations.
• Confirmation that variations can be added to cart without errors on a fresh test.

If you need anything else from my side—additional logs, plugin lists, or host details—let me know right away. I’m ready to move fast.