Resolve WooCommerce PayPal Gateway

I’m running a live WooCommerce store and my checkout is failing whenever a customer selects PayPal. The order never completes, WooCommerce shows a generic “payment failed” notice, and the PayPal logs record an “invalid request” response. Everything else on the site is stable, so this is clearly a payment-gateway specific bug that needs urgent attention.

Here’s what I know so far:
• WooCommerce, WordPress, and all plugins are up to date.
• PayPal is set up with the official WooCommerce PayPal Payments plugin (latest version).
• API credentials have been double-checked and re-issued, yet the error persists.

I need an experienced WooCommerce developer who can:
• Trace the exact cause of the PayPal failure—whether it’s plugin conflicts, webhook misconfiguration, outdated API calls, or server-side blocks.
• Implement the fix and verify that transactions process end-to-end, orders are marked paid in WooCommerce, and the customer receipt emails fire as expected.
• Provide a short change log or summary of what was corrected so I can keep future updates safe.

Access to staging and production environments can be arranged, along with cPanel and error logs. Please be comfortable working directly with WooCommerce core, the PayPal Payments plugin, PHP, and WordPress hooks. I’m ready to approve the milestone as soon as PayPal checkouts run smoothly again.