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

# Test Webhook

Enqueue a sample event to exercise your endpoint. It sends a real, signed message of a concrete type
the destination is subscribed to (the first of its `eventTypes`, defaulting to `sandbox.created`),
carrying the **normal delivery envelope** with `event.data.test = true` — so you exercise your real
verifier and parser. Delivery is **asynchronous** — this returns once the message is accepted; check
[deliveries](/api-reference/webhooks/deliveries-list) for the outcome.

<Note>
  The sample is published through your org's webhook app, so it is **not** isolated to this one
  destination: any other destination subscribed to the same event type (and matching scope) also
  receives it (likewise marked `event.data.test = true`).
</Note>

See [Webhooks](/sandboxes/webhooks).

<ParamField path="id" type="string" required>
  Destination ID (`whk_…`).
</ParamField>

<ResponseExample>
  ```json 200 theme={null}
  {
    "ok": true,
    "eventType": "sandbox.created",
    "messageId": "msg_2aB…"
  }
  ```
</ResponseExample>

`messageId` is the delivery's message id — find its attempt under [deliveries](/api-reference/webhooks/deliveries-list).