Webhook Failure Troubleshooting Guide

Webhook failures are difficult because the request path is asynchronous. There is usually no user sitting in front of the screen when the failure happens.

That means debugging should begin with a simple question: where exactly did the failure happen?

In practice, most incidents fall into one of four buckets:

• provider could not deliver the webhook
• endpoint returned an error or timed out
• background processing failed after a successful response
• the same event was retried and processed unsafely

Step 1: Check provider delivery logs first

Before reading application logs, check the provider dashboard. Platforms like Stripe, Paddle, and GitHub usually record:

• delivery timestamps
• HTTP response codes
• retry attempts
• response latency

This immediately tells you whether the failure happened before the request reached your application or after it did.

Step 2: Classify the failure type

Once you inspect provider logs, classify the incident into one of these categories:

HTTP 4xx

Usually indicates request validation failure, signature verification failure, or route misconfiguration.

HTTP 5xx

Usually indicates application exception, dependency failure, or server-side crash.

Timeout

Usually means the handler is doing too much synchronous work before returning.

HTTP 200 but business state is wrong

Usually means downstream processing or queue workers failed after the request was acknowledged.

Step 3: Inspect endpoint behavior

If the provider log shows the request reached your endpoint, examine how the handler behaves.

Common questions:

• Does the route return the expected status code?
• Does signature verification reject valid requests?
• Does the request path call external APIs before returning?
• Do database queries or locks slow the response path?

If the handler is slow, the incident is often really a timeout problem. See webhook timeout debugging .

Step 4: Verify queue workers and downstream jobs

A successful webhook response does not guarantee successful business processing.

Many systems acknowledge the webhook quickly, then dispatch jobs to:

• update billing records
• grant access
• send notifications
• sync downstream services

If workers are stopped, failing, or backed up, the provider may show a successful delivery while your application state remains wrong.

For architecture patterns around this, see webhook processing architecture .

Step 5: Check whether retries created duplicate side effects

If the provider retried the same event, inspect whether the first attempt partially succeeded.

Look for:

• duplicate subscription activations
• multiple emails for one event
• repeated provisioning jobs
• multiple local rows tied to one provider event

If duplicates are possible, the incident is no longer only a delivery problem. It is also an idempotency problem.

See idempotent webhooks in Laravel .

Step 6: Decide whether replay is safe

Engineers often replay failed events as soon as they identify a problem.

That can be correct, but only if:

• the event was not already fully processed
• duplicate side effects are prevented
• current resource state is understood

Otherwise replay may make the incident worse.

See replaying failed webhooks safely .

If you want the broader production-level view, see webhook debugging in production .

If you want the incident-response workflow version, see webhook incident playbook .