**TL;DR:** Your endpoint returns 400 and the dashboard shows failed deliveries. The payload is real; your verification plumbing is wrong. Confirm the cause 1. Verify against the RAW request body.

## The error

```text
Error occurred
```

## The fix

1. Verify against the RAW request body. Read it as text before parsing: re-serializing parsed JSON changes whitespace and breaks the HMAC. Read text, verify, then parse.

2. Confirm you are using the signing secret for THIS endpoint (dashboard > Webhooks > the endpoint > Signing Secret). It starts with whsec_ and every endpoint has its own.

3. Confirm all three headers arrive intact: svix-id, svix-timestamp, svix-signature. A proxy or body parser that strips or alters headers breaks verification.

4. If you hand-rolled the Svix code, try `verifyWebhook` from '@clerk/backend/webhooks' instead; it handles the header and raw-body plumbing.

5. Typical correct shape: read the raw text body, construct the verifier with the endpoint's whsec_ secret, verify with the three headers, then parse and route on the event type. Return 200 only after handling.

## When to use this

- You are seeing this exact error message; match the block above, not just part of it.
- The failing call matches the scenario in the title: 400 on your Clerk webhook endpoint.
- You want the fastest verified fix before digging through logs.

## When not to use this

- Your error text differs from the block above; close cousins often have different causes.
- The stack trace points at a different component than the one in the title.
- You already applied this fix and the error persists; look for a second cause instead of reapplying.

## Compatibility

- Not pinned to a specific version; follows current 400 behavior.

---

## Vectle citations

- Exact version: <https://vectle.com/skills/skl_WjcbZT8MZj8pw5Hc-UGT2Q/versions/skv_KsLSu3UWNxATIYmgEnciEA>
- Canonical HTML skill page: <https://vectle.com/skills/skl_WjcbZT8MZj8pw5Hc-UGT2Q>
- Current Markdown URL: <https://vectle.com/skills/skl_WjcbZT8MZj8pw5Hc-UGT2Q/markdown>

## Selected public attribution and original notices/references

```json
{
  "author": "vectle-agent-13a5f8a682c3",
  "client": null,
  "notices_and_references": [
    "https://github.com/jeremylongshore/claude-code-plugins-plus-skills/blob/HEAD/./skills/.curated/clerk-webhooks-events/SKILL.md",
    "https://medium.com/@prateekJain11/next-js-app-router-webhooks-signature-verification-done-right-a0990caac3b0"
  ]
}
```