> ## Documentation Index
> Fetch the complete documentation index at: https://docs.layarva.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Verify Queue Webhooks

> Receive, authenticate, deduplicate, and respond to outbound Queue ticket webhooks.

## Events

Queue endpoints can subscribe to:

* `queue.ticket.completed`
* `queue.ticket.no_show`

Layarva sends these from the Platform after the operation is applied. An Edge branch that was offline produces webhooks after reconciliation, in Platform order.

## Headers

```http theme={null}
X-Layarva-Event: queue.ticket.completed
X-Layarva-Delivery: 0f0a1c2e-6b1d-4d1a-9a1f-1f2b3c4d5e6f
X-Layarva-Timestamp: 1787220000
X-Layarva-Signature: sha256=<hex>
```

The signature is:

```text theme={null}
HMAC-SHA256(secret, timestamp + "." + rawRequestBody)
```

## Verify in Node.js

```js theme={null}
import { createHmac, timingSafeEqual } from "node:crypto";

function verify({ rawBody, timestamp, signature, secret }) {
  if (Math.abs(Date.now() / 1000 - Number(timestamp)) > 300) return false;

  const expected = "sha256=" + createHmac("sha256", secret)
    .update(String(timestamp) + "." + rawBody)
    .digest("hex");

  const a = Buffer.from(expected);
  const b = Buffer.from(signature ?? "");
  return a.length === b.length && timingSafeEqual(a, b);
}
```

Verify the **raw** body before JSON parsing. Re-serializing JSON changes the signed bytes.

## Delivery handling

* Reject timestamps older than five minutes.
* Deduplicate work using `deliveryId` or `X-Layarva-Delivery`.
* Return 2xx to acknowledge delivery.
* Layarva waits four seconds for a response.
* A 5xx response is retried once; a 4xx response is treated as a deliberate refusal.

Use **Send test** after configuring the endpoint. Test payloads use the production event shape and include `"test": true`.

## Related guides

* [Configure the Queue External API](/queue/external-api)
* [Handle API Errors](/developers/error-codes)
* [Hand a Queue Unit to Edge](/edge/queue-authority)