Fix WooCommerce Variations Issue

I’m running a WooCommerce-based online store where I sell honey products, and I’ve recently encountered a critical issue affecting the shopping experience. When customers attempt to select product variations (such as size or type), the site triggers a 500 Internal Server Error. In some cases, the browser console also reports a 403 Forbidden error when trying to load certain resources. As a result, customers are unable to complete their purchases.

I’m looking for a developer who can thoroughly investigate and resolve this issue. I will provide the full website source code, and I’d like you to replicate the problem in a local development environment using XAMPP. From there, the goal is to identify the root cause and implement a reliable fix.

Scope of work includes:

Setting up the website locally (XAMPP environment)
Reproducing the variation selection issue
Debugging server-side and client-side errors
Identifying conflicts (plugins, themes, or custom code)
Fixing the issue and ensuring variation functionality works smoothly
Providing a brief report on the cause and solution

Please include in your response:

Your approach to debugging this type of issue
Estimated time required to resolve it
Your experience working with WooCommerce, especially troubleshooting similar problems