I renamed my Gumroad account to tidy up the URL. The old one had a number in it that looked like a placeholder, and the new one matched the brand. It took about ten seconds.
Every buy button on my site pointed at the old address. Gumroad does not redirect a renamed vanity URL. So every one of them started returning a 404.
Nothing told me
This is the part worth dwelling on. The site did not error. Analytics showed clicks on the buy button, exactly as before. Uptime monitoring was green, because my site was fine — it was the destination that had gone.
From every angle I was set up to look at, things were working. The only signal available was an absence: no sales. And no sales is indistinguishable from a slow week when you are starting out.
The class of failure this belongs to
Loud failures are cheap. A 500 page gets noticed in an hour, because it is obvious and someone complains.
Expensive failures are the ones where the system reports success. The click fires. The form submits. The page loads. Something further down the chain quietly does not happen, and every dashboard you own is looking at the wrong end of it.
Delivery work has exactly the same shape. A status report that goes out on time but to a stale distribution list. An escalation raised in a channel nobody watches. A handover document written and never opened. The process ran. The outcome did not happen. And because the process ran, nothing flags.
What I changed
Two things, both small.
Commerce destinations are no longer written into pages. They live in one setting, referenced by name, so changing where a button points is a single edit rather than a hunt through content. That is a fix for the specific bug.
The more useful change was the habit: when I change an address, I now check the thing at the other end of it. Not the click. The arrival.
It is a short list of places where that applies — payment links, form actions, webhook endpoints, redirect targets, notification addresses. Worth writing down once for whatever you run, because in every one of those cases the failure is silent and the metric you would normally trust keeps reporting green.
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