WooCommerce Checkout Not Working After an Update? 9 Fixes That Actually Work

Your store was taking orders yesterday. Today customers click “Place order” and nothing happens, or they see an error, or the payment goes through but no order appears. If this started right after an update, the cause is almost always findable in under an hour, if you check things in the right order.

I fix broken WooCommerce checkouts every week. This is the exact order I check things in.

First: stop the bleeding

• Check that you have a recent backup before changing anything.
• Place a test order yourself in a private window and note the exact error (screenshot it).
• If orders are failing right now, consider adding a short notice at checkout with another way to order (phone, WhatsApp) while you fix it.

The 9 most common causes, in the order I check them

1. A plugin conflict after the update

The most common cause. One plugin updated and now conflicts with WooCommerce or another plugin. Use the free Health Check & Troubleshooting plugin to disable plugins only for your own session, then re-enable them one by one until checkout breaks again.

2. Payment gateway plugin out of date or misconfigured

Stripe, PayPal, and other gateways update often to follow their API changes. Check the gateway plugin is up to date, the API keys are still the live keys (not test keys), and webhooks are still connected in the payment provider dashboard.

3. Caching the checkout or cart page

Cart, checkout, and My Account pages must never be cached. After an update, caching plugins or hosting cache can start serving an old checkout page. Exclude these pages and clear all caches, including any CDN.

4. JavaScript errors in the browser

Open your browser’s developer console (F12) on the checkout page. A red error mentioning a plugin or theme file usually points straight at the culprit.

5. The block checkout vs. classic checkout switch

Newer WooCommerce versions use the block-based checkout by default. Some payment and checkout-field plugins only work with the classic checkout. If an extension stopped showing its fields, this is likely why.

6. Theme template overrides are outdated

Go to WooCommerce → Status and scroll to Templates. If it lists outdated template files in your theme, the theme needs updating or those overrides need fixing.

7. PHP version or memory limits

A plugin update may need a newer PHP version or more memory. WooCommerce → Status shows both. Your host can raise them in minutes.

8. Security or firewall rules blocking checkout requests

Security plugins and hosting firewalls sometimes block the checkout’s background requests after an update. Check their logs for blocked requests to /?wc-ajax= or the Store API.

9. Orders are created but stuck in “Pending payment”

If payments succeed but orders stay pending, the payment provider’s webhook is not reaching your site. Re-save the webhook URL in the provider dashboard and check the WooCommerce logs (WooCommerce → Status → Logs).

How to stop it happening again

• Update on a staging copy first, test checkout, then update the live site.
• Keep automatic daily backups stored off the server.
• Place one real test order after every update.
• Or hand updates to someone who does all of the above every month.

Need it fixed today?

If you would rather not debug this yourself, a Fix Sprint finds and fixes the cause within 48 hours for a fixed $249, and if the agreed problem is not fixed, you do not pay. Not sure what is wrong? Start with a free scan.