Protect customer-specific responses
Caching public product content can reduce origin work, but cart, checkout and account pages contain session-specific information. A CDN, host cache and WordPress cache plugin can each make an independent decision, so changing only one layer may not be sufficient.
Inventory dynamic URLs, cookies and API requests used by the installed WooCommerce version and extensions. Use the supported exclusions for the actual caching products. Do not assume every store uses the same checkout route or plugin behavior.
Test separate sessions
Use two isolated browser profiles or test users. Add different products to each cart and verify that prices, cart contents, account details and checkout state do not cross between them. Inspect response headers and cache-status signals where available, while remembering that a single header does not reveal every cache layer.
Use the payment provider's test environment. Confirm that the test does not send real fulfillment requests or customer emails. Test logged-out and logged-in flows, coupon changes, shipping and a representative mobile session.
Correct the narrow layer
If a private response is cached, stop the unsafe caching rule and invalidate the affected cache according to provider instructions. Preserve any evidence needed to assess exposure, and follow the organization's incident process. Do not publish customer information while diagnosing.
After correction, repeat the two-session test and verify public static assets can still be cached appropriately. Document the bypass rules and rerun the test after changing a CDN, cache plugin or checkout extension.
Further reading
Read the official documentation. For help applying these checks, explore Clouvenix services.