# Webhook Debugger & Relay Generate a unique webhook capture URL, inspect incoming requests, validate signatures, and replay payloads to a target endpoint > Canonical page: https://elysiatools.com/en/tools/webhook-debugger-relay - **Category:** Network - **Keywords:** webhook, debugger, relay, request bin, hmac, replay ## Overview The Webhook Debugger & Relay tool provides a unique capture URL to inspect, validate, and forward incoming HTTP requests. It allows developers to view payload details, verify HMAC signatures, and selectively replay webhooks to local or remote endpoints, making API integration testing seamless and secure. ## Inputs - **Relay Target URL** (text): https://api.example.com/webhooks/real-endpoint - **Signature Secret** (text): whsec_test_123 - **Signature Header** (text) - **Auto Replay Matching Requests** (checkbox) - **Method Filter** (select) - **Body Must Contain** (text): "event":"invoice.paid" - **Stored Request Limit** (number) ## When to use - Testing third-party API integrations like Stripe or GitHub before deploying to production. - Troubleshooting failed webhook deliveries by inspecting raw headers, payloads, and signatures. - Forwarding specific webhook events to a local development environment using conditional auto-replay. ## How it works - Generate a unique capture URL to receive incoming webhook requests. - Configure optional HMAC signature validation by providing your secret and header name. - Set method filters or body text requirements to isolate specific events. - Inspect captured payloads in the dashboard and manually or automatically relay them to your target URL. ## Use cases - Isolating and debugging specific payment events from Stripe or PayPal. - Validating GitHub push event signatures and forwarding them to a CI/CD pipeline. - Creating a temporary request bin to inspect undocumented API callbacks. ## Frequently asked questions ### What is a webhook capture URL? It is a temporary, unique endpoint generated by the tool to receive and log incoming HTTP requests from third-party services. ### How does signature validation work? By entering your signature secret and header name, the tool calculates the expected HMAC hash and compares it against the incoming request to verify authenticity. ### Can I automatically forward requests to my local server? Yes, by enabling the Auto Replay feature and setting a Relay Target URL, incoming requests that match your filters will be forwarded automatically. ### How many requests can I store? You can configure the stored request limit between 10 and 200 requests. Older requests are overwritten once the limit is reached. ### Can I filter which webhooks are captured or replayed? 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