The checkout bug nobody notices for three weeks

The most expensive WordPress problem isn't the dramatic one. A site that's completely down gets noticed within the hour — by you, your staff, your customers. The expensive one is the checkout that half-works.

The store looks perfect. Products load, the cart works, customers click "pay"… and the payment silently fails, or the order goes through but the confirmation email never sends, or one payment method quietly errors while the other still works. Traffic looks normal. The site looks fine. Only the revenue is wrong — and revenue is noisy enough that a 40% dip reads as "slow month" for embarrassingly long.

How it happens

• A payment gateway update changes an API requirement; the plugin on your site is two versions behind.
• An expired key or certificate — Stripe/PayPal credentials rotate, webhooks start failing, nothing on the storefront changes.
• A plugin conflict after routine updates breaks one step of checkout — often only for one payment method, or only on mobile.
• Email dies. Orders succeed but confirmations stop sending, so customers assume failure, re-order or charge back.

Notice what's common: none of these throw an error you see. They fail into a log nobody reads.

What "found out the same day" requires

• A real test order on schedule — an actual transaction through the live checkout (refunded automatically). This is the only check that proves the whole chain: cart, gateway, confirmation, email.
• Order-rate watching — if a store that averages an order every 3 hours goes 12 hours silent, that's an alert, not a coincidence.
• Webhook and email monitoring — failed gateway callbacks and a mail queue that's stopped are both loud signals, if anything is listening.
• Checkout re-test after every update — updates are when most of these break, so the test belongs in the update routine itself.

A down site costs you a day. A half-working checkout costs you a quarter.

This is the entire reason our WooCommerce plan exists as a separate tier: a brochure site needs uptime monitoring, but a store needs its money path monitored — and those are different disciplines.