A WooCommerce checkout can be broken while the checkout URL still returns a normal page. The form may not submit, the payment method may disappear, the Store API may fail, or the final confirmation may never appear. From the outside, the store is online; from the buyer's path, it is not converting.
This guide is the entry point. It helps locate the failure family before opening a specialized guide: emptied cart, stuck checkout, payment failure, 500 error, validation error or missing confirmation.
Map the symptoms
Common symptoms do not all mean the same thing:
- Empty cart after add-to-cart: cache, session, cookie, domain or Store API.
- Place order button missing or inactive: theme, script, validation or Checkout Blocks.
- Payment methods invisible: gateway, currency, shipping, SSL, webhook or configuration.
- Infinite spinner: Ajax, `update_order_review`, payment iframe, timeout or 3DS.
- 500 error or white screen: fatal PHP error, plugin, theme, server endpoint or update conflict.
- Missing thank-you page: gateway return, order creation, redirect or confirmation.
Each symptom should point to a dedicated guide. For example, WooCommerce cart emptied is not handled like WooCommerce payment failed.
Verify in the right order
Start with the first signal lost. If add-to-cart fails, testing payment is premature. If the cart is stable but payment methods disappear, focus on gateway eligibility, scripts and configuration. If everything works until final click, inspect order request, gateway return and confirmation.
Document each step with expected and observed results. Good proof does not say "checkout broken"; it says "cart stable, checkout loaded, payment method missing after shipping recalculation" or "order submitted, final request returns 500".
| First signal lost | What is premature to test | Where to focus |
|---|---|---|
| Add-to-cart fails | Payment | Cart, session, cache, Store API |
| Cart holds, payment methods disappear | The final click | Gateway eligibility, scripts, configuration |
| Everything holds until the final click | Upstream steps | Order request, gateway return, confirmation |
Interpret without mixing causes
A transient incident is not automatically a false positive. If the signal fails once and recovers, it may be a short real outage, saturation or external dependency. A false positive is proven by a monitoring flaw: brittle selector, unavailable synthetic product, insufficient wait or an intentional business rule.
Persistent incidents need immediate action. Transient incidents need evidence and closer observation. False positives need monitor adjustment. Those three outcomes should not be reported the same way.
Controlled lab example
Starting point: an up-to-date test store with a shipping plugin added the day before. Reproduced failure: the synthetic product is added, the cart remains correct, then checkout spins forever after recalculation. The page status remains HTTP 200. The business signal is the missing final state: no stable payment section, no order, no confirmation.
Ruled-out hypotheses guide the diagnosis: not a lost cart (it is intact entering checkout), not a payment refusal (no attempt is transmitted), not plain latency (the wait never resolves). The proof then records the first failing run, the affected recalculation request, error class, last failing run and first recovered run. It avoids personal data, card details and real customer cart contents.
Confirm recovery
Checkout recovery means the same controlled path validates the critical steps again. For cart incidents, the cart must survive to checkout. For payment incidents, expected methods must be visible and coherent. For server errors, both status and page content must recover.
Prevent recurrence
Most broken checkouts follow a release: a plugin added or updated, a theme change, a cache or gateway switch. Keep a dated log of those changes, replay the controlled journey right after each deployment, and keep a permanent monitor on the step that had broken so a relapse is detected before the customer.
The service scope is described in features, including monitored pages and incident proof. To validate a first site, request a free audit, then compare cadence, monitors and reporting in plans.