# endpoint_verification_failed

The webhook endpoint did not accept the signed test event. What causes the BioFlow API's endpoint_verification_failed error (HTTP 422) and how to fix it.

HTTP 422 · `application/problem+json` · The webhook endpoint did not accept the signed test event.

## What causes it

- When creating a webhook endpoint (or changing its URL), BioFlow sends a signed `endpoint.test` event synchronously — your endpoint did not respond 2xx.

## How to fix it

- Make the endpoint reachable over HTTPS and respond 2xx to the verification POST, then retry.
- Verify signatures over the RAW request bytes — parsing and re-serializing the body before verifying breaks the signature.

## Example response body

```json
{
  "type": "https://getbioflow.com/docs/api/errors/endpoint-verification-failed",
  "title": "The webhook endpoint did not accept the signed test event",
  "status": 422,
  "instance": "urn:request:req_01abc",
  "code": "endpoint_verification_failed",
  "request_id": "req_01abc"
}
```

Branch on the stable `code` field — `title` and `detail` are for humans and may
change. `type` (`https://getbioflow.com/docs/api/errors/endpoint-verification-failed`) always resolves to this page. Quote
`request_id` when contacting support. Full code registry on the
[API docs hub](/docs/api#errors); the complete surface is in the
[interactive reference](/docs/api-reference).