Quick Diagnosis
Identify the checkout step that fails: validation, totals, payment handoff, return, order creation, or email.
Problem
WooCommerce Checkout Not Working
Diagnose WooCommerce checkout failures by separating cart, validation, payment, shipping, tax, cache, theme, and plugin-conflict causes.
Problem
Customers cannot complete checkout reliably.
For: WooCommerce store owners and agencies responding to checkout failure reports.
Workflow
What to review
Cache Warning
Checkout pages need dynamic behavior. Page cache can create failures that look like payment problems.
WooCommerce CheckoutSeverity: HighLast reviewed: 2026-09-16
Diagnosis
Symptoms, causes, checks, and fixes
Symptoms
- Checkout errors appear before payment.
- Customers are redirected back to cart.
- Totals change unexpectedly.
- Only mobile, logged-out, or specific shipping/payment combinations fail.
Most Common Causes
- Cache on cart/checkout.
- Payment gateway issue.
- Theme JavaScript conflict.
- Shipping/tax configuration.
- Plugin conflict.
- Required checkout fields failing validation.
How To Confirm The Cause
- Test checkout as a guest on mobile and desktop.
- Check browser console and network errors.
- Review WooCommerce status/logs and order notes.
- Disable checkout caching rules.
Fixes
- Exclude cart/checkout/account from cache.
- Fix gateway, shipping, or tax configuration.
- Rollback the conflicting theme/plugin change.
- Test with a staging-safe payment method.
How To Verify The Fix
- Complete a low-value or sandbox order.
- Confirm order status and emails.
- Check logs for the same failure.
When To Contact Support
Escalate to the payment gateway, host, or developer based on the failing step.
References