Payments work in test mode and fail live

Test mode forgives almost everything. Live mode does not. In AI-built apps the same six things break every time, and five of them are about the webhook — the part nobody tests, because in test mode the checkout still looks like it worked.

1. You switched the keys and not the webhook

Test and live are two separate worlds. A webhook endpoint created in test mode does not exist in live mode, so after the switch the payment succeeds and your app never hears about it.

How to checkOpen your payment dashboard in live mode and look at the webhook list. If it is empty, that is your bug.

What to changeCreate the endpoint again in live mode, pointing at the same URL, and copy the new signing secret into your host's environment variables. Redeploy.

The signing secret is different in live mode. Reusing the test one makes every event fail signature verification.

2. The webhook signature is verified against a parsed body

Signature checks run on the exact bytes that were sent. Most frameworks parse JSON before your code sees it, which changes those bytes, and every event is rejected as invalid.

How to checkYour logs show signature verification failures while the dashboard shows the event was delivered.

What to changeRead the raw body for that route only. In Next.js app router that means reading the request text before parsing; in Express it means a raw body parser on the webhook path.

This is the single most common Stripe bug in generated code, and it only appears in production because test mode is usually driven from the dashboard.

3. The order is created in the browser after redirect

Generated code often marks the order paid on the success page. A customer who closes the tab, loses connection, or pays and walks away never triggers it. You have their money and no order.

How to checkPay once and close the tab immediately at the redirect. If no order appears, this is it.

What to changeCreate the order from the webhook, on the server. The success page should only display what the server already recorded.

The reverse also happens: an order created on the success page that never checks whether payment actually succeeded.

4. Live mode requires details the account never filled in

Live payments need a real business profile, a statement descriptor and often a verified bank account. Until those exist, charges are declined with a message nobody reads.

How to checkLook at the declined charge in the dashboard and read the reason, not the generic error in your app.

What to changeComplete the account details. Then show the real decline reason to the customer instead of a generic failure.

Some countries need extra verification that takes days. Find this out before launch day, not on it.

5. The prices are test objects

Products and prices created in test mode have different identifiers in live mode. Hardcoded identifiers stop existing the moment you switch.

How to checkThe error mentions a resource that cannot be found, with an identifier that looks right.

What to changeRecreate the products in live mode and move the identifiers into environment variables, one set per mode.

Same for tax rates, coupons and shipping rates.

6. Nothing retries, so one failure loses the order forever

Webhooks fail sometimes. Providers retry for days, but only if your endpoint answers with a failure code. Generated code usually answers with success no matter what happened.

How to checkForce an error inside your handler and see what status the endpoint returns.

What to changeReturn success only after the work is done. On failure, return an error status so the provider retries, and make the handler safe to run twice.

Running twice must not create two orders. Store the event identifier and ignore repeats.

Not one of these five?

Send me the link and the exact error text. I will tell you what is broken and what it would take to fix, in writing, within 24 hours. That part is free, and you are not obliged to hire me afterwards.

If you do want it fixed: emergency rescue starts at $600, and I name one fixed number before I start.

Send me the link