A broken checkout is rarely a single page being down. The product page can still load, the cart can still open, and the checkout form can still display while the purchase path is already blocked. The failure often appears between cart state, payment method selection, 3DS, validation or order confirmation.
CashFlowCanary treats the funnel as a sequence. It watches the pages that matter, classifies the incident and keeps evidence before the team starts correcting the issue. That evidence is what separates "the site looks fine" from a concrete checkout incident that can be assigned.
The method is described in the feature overview. The commercial scope depends on cadence, number of monitored pages and reporting needs, so the next step is to compare plans. For a first store or a client portfolio, the safest entry point is a free audit.
The anatomy matters because each breakpoint has a different owner. A cache/session issue, a payment gateway issue and a confirmation failure do not require the same fix. Monitoring should make that distinction visible early.