Frequently Asked Questions About Webhook Testing & Debugging
How does an online webhook tester and payload inspector work?
An online webhook tester generates a unique temporary HTTP endpoint URL. When external services (like Stripe, PayPal, or GitHub) trigger event notifications to that URL, our listener captures and formats the raw HTTP method, headers, query parameters, and JSON payload in real time.
How can I test Stripe and PayPal payment webhooks locally?
Copy your unique endpoint URL from this tool and paste it into your Stripe or PayPal Developer Dashboard under Webhook Endpoints. Trigger a test event (e.g., payment_intent.succeeded) and instantly verify the JSON body structure and signature headers.
How do I verify webhook cryptographic signatures (HMAC SHA-256)?
Most modern API providers send an authentication header (such as Stripe-Signature or X-Hub-Signature-256). This tool displays all raw headers alongside the unparsed raw payload body, allowing you to compute and verify the exact HMAC SHA-256 hash against your shared signing secret.
How long are received webhook payloads stored in this tester?
In accordance with Ask AI Mode Kit security protocols, received webhook logs are retained in volatile memory and automatically purged after 24 hours to prevent unauthorized access and data leakage.
Can this webhook listener capture GET, POST, PUT, and DELETE HTTP methods?
Yes. The listener accepts all standard HTTP request methods (POST, GET, PUT, PATCH, DELETE, OPTIONS) and automatically responds with an HTTP 200 OK status code.
What is the difference between a polling API and a webhook?
A polling API requires your client server to repeatedly query the remote server for updates every few seconds. A webhook is an event-driven "reverse API" where the remote service pushes instant updates to your endpoint only when an event occurs, drastically reducing server load.
How do I debug webhook delivery timeouts and failed retries?
Payment providers retry webhook delivery exponentially if your server responds slowly or returns 5xx errors. By testing with this tool, you can isolate whether payload failures stem from backend processing bottlenecks or malformed JSON payloads.
Can I test GitHub repository push, pull request, and release webhooks?
Yes. Add your generated endpoint to your GitHub repository under Settings → Webhooks, choose application/json, and trigger test commits to inspect GitHub’s payload architecture.
Does this tool support CORS pre-flight OPTIONS requests?
Yes. The endpoint automatically responds to Cross-Origin Resource Sharing (CORS) preflight requests with appropriate Access-Control-Allow-Origin: * headers.
Is this webhook debugging tool completely free without an account?
Yes. Ask AI Mode Kit provides instant webhook endpoints without email sign-ups, credit cards, or subscription paywalls.