A checkout problem can prevent an order entirely or make buying unnecessarily difficult. Start by identifying the exact stage: product added to cart, address entered, shipping calculated, payment selected, or order submitted. Each points to a different set of checks.
Match the symptom to the first check
| Symptom | Check first |
|---|---|
| No shipping method available | Shipping zones, address, product shipping requirements, and method conditions |
| Payment method missing | Currency, country restrictions, gateway settings, and Checkout Block compatibility |
| Place order spins indefinitely | Browser console, checkout request response, PHP logs, and script optimization |
| Customer charged but order pending | Provider transaction and webhook delivery |
| Cart or totals unexpectedly reset | Session handling, cookies, page caching, and domain consistency |
| Mobile users cannot complete fields | Keyboard behavior, validation messages, overlays, and responsive layout |
Reproduce the issue consistently
Use the same product, customer type, country, postcode, coupon, and payment method as the failed attempt. Compare a guest checkout with a logged-in customer. Note the device and whether the problem began after an update, custom field change, or new optimization setting.
First confirm whether you use the Checkout Block or classic checkout. Customizations written for one may not apply to the other. Do not change checkout architecture without checking extension compatibility.
Fix shipping and totals before testing payment
Check that the customer’s address matches the intended shipping zone and that an enabled method is eligible. Test tax, coupon, and shipping calculations with representative addresses. Make unavoidable fees visible before the final purchase step; unexpected totals are a usability problem even when the code works correctly.
Check requests, caching, and conflicts
Cart and checkout should not receive ordinary public full-page cache responses. Review the host and optimization plugin’s WooCommerce exclusions, including session cookies and dynamic requests. Test JavaScript delay or combination settings individually rather than disabling every optimization permanently.
Investigate conflicts on staging. Keep live payment credentials, automated renewal charges, and outbound customer messages out of routine test runs. Use server logs alongside browser errors to find the cause.
Separate payment failure from checkout failure
A declined card, provider outage, missing authentication step, or blocked webhook needs a different response from a malformed checkout field. Compare order notes with provider records before retrying or changing order status. Follow the payment gateway checklist for that part of the investigation.
Retest after the fix
- Guest and logged-in customers on desktop and mobile.
- Representative shipping destinations and unavailable destinations.
- Coupons, required fields, and clear validation messages.
- Successful, declined, and cancelled sandbox payments.
- Correct order totals, stock adjustment, and confirmation email.
Track checkout events and completed orders if analytics is configured, but do not assume every abandoned checkout is a technical failure. Shipping cost, purchase intent, and payment preferences can also explain abandonment.
Official reference: WooCommerce order troubleshooting.
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