If a Lovable Stripe webhook is not working, follow one test event from its destination through the handler to the application's final state. A checkout screen can look successful while the event reaches the wrong deployment, fails verification or never updates the intended record.

Use the provider's test environment and synthetic customer data. Record the app version, event identifier, destination and time. Keep secrets and full customer payloads out of shared reports. Do not begin by removing signature checks or granting access from a success-page URL.

First separate the three possible boundaries

  • Delivery: did the intended endpoint receive the event?
  • Acceptance: did the endpoint verify and accept the request?
  • Business effect: did the correct user, subscription or order reach its intended state?

An HTTP success response only answers part of that chain. The next checks depend on the actual integration, event format and app backend; not every Lovable project uses the same infrastructure.

No delivery at the intended destination

Compare the configured destination with the deployed handler. Check the environment and the event types selected for that destination. Use the event's delivery history to distinguish a missing delivery, an incorrect URL and an endpoint returning an error.

If you reproduce locally, Stripe's CLI trigger documentation explains how test events are generated. A local listener and a production destination have different configuration. A successful local test does not establish that the published endpoint is receiving the same event.

Delivery arrives but signature verification fails

Compare the endpoint's signing secret, the signature header and the raw request bytes used by the handler. Stripe's signature troubleshooting guide explains why the body supplied for verification must match the delivered bytes. Verify with the official SDK for the integration in use.

Do not parse JSON and then rebuild a string before verification if the SDK expects the original body. Check where the framework reads or transforms the request. A secret for a different destination or environment can also produce a verification failure; the error alone does not select the cause.

Accepted event, missing application change

Now follow the handler's own decision. Did it recognise the event type? Did it find the intended customer or account? Did the record update succeed? If work is queued, is the job durably recorded and can an operator see a failed run?

Define the expected result before changing code. For a one-off purchase, it may be one specific entitlement. For a subscription, lifecycle states need explicit treatment. Avoid using a generic “payment succeeded” boolean to stand in for an undefined product rule.

Repeated delivery should not repeat the business effect

Stripe documents duplicate deliveries and ways to identify repeated events in its webhook guidance. Design the processing rule around the actual operation and storage transaction. A duplicated event must not create an extra order, repeated email or conflicting access change.

Retry handling is part of the same design: a handler that marks an event complete before the intended update is safely recorded can hide a failed operation. A production integration needs durable state and an explicit recovery path, not just an in-memory list of event IDs.

A small example of signed bytes and replay

The downloadable Node fixture signs a fictional payload locally. It checks that the same bytes pass, parsing and reserializing the body fails the check, a different secret fails and an expired sample timestamp fails. A separate case processes the same fictional event twice and asserts that the sample business effect occurs once.

Run with Node 22 or later:

node --test app-repair-proof.mjs

The recorded results show the assertions that ran. This fixture is an illustration using synthetic data and local cryptography. It never contacts Stripe, does not implement the full Stripe signature format and is not a replacement for the official SDK or a production payment system.

What would establish the repair?

Use the intended deployed test configuration. Follow a known event into the handler, verify its accepted result and inspect the resulting application state through the normal user flow. Repeat the event and check that the effect is not duplicated. Include relevant failure, cancellation or reversal paths in the agreed scope.

Record exactly what was tested. A single test purchase does not establish the entire payment lifecycle. If the problem remains unclear, the Lovable app rescue service and production-readiness review provide a way to scope the investigation. Send the app URL and the stage that fails.