Why billing health degrades silently
Billing breakage almost never announces itself. A failed payment doesn't throw an error in your application logs — it just quietly moves a paying customer toward cancellation. A webhook endpoint that starts timing out doesn't take your product down; it just stops syncing subscription states, and you find out weeks later when a churned user still has access or a paying one gets locked out.
The deeper problem is that every one of these failures looks like normal churn from the outside. If you don't separate involuntary churn from voluntary, recovered revenue from lost, soft declines from hard ones, the leak hides inside an aggregate number that "looks about right." Stripe ships safe defaults, but defaults are tuned for the average business — not for your card mix, your price points, or your customers' countries.
That's why billing health needs a periodic, deliberate review. The 12 checks above take an afternoon to verify and a few days to fix — and they usually pay for themselves with the first recovered invoice.