Webhooks

Webhooks can be managed in the dashboard under Settings → Webhooks, or through the API when you want them created as part of provisioning a customer.

For what the events contain, see Event reference. For handling them, see Receive messages.

GET /v1/webhooks/events

The catalogue of subscribable events.

Scope: account:read

Read this rather than hard-coding a list, which goes stale the next time an event is added.

200

{
  "data": [
    {
      "value": "message.delivered",
      "group": "messages",
      "label": "Message delivered",
      "description": "WhatsApp confirmed the message reached the recipient's device.",
      "label_key": "webhooks.events.messageDelivered.label",
      "description_key": "webhooks.events.messageDelivered.description"
    }
  ],
  "has_more": false
}

The *_key fields are i18n keys used by our own dashboard. Ignore them and use label and description.

POST /v1/webhooks

Scope: webhooks:write · Accepts Idempotency-Key

{
  "name": "Order updates",
  "url": "https://api.example.com/hooks/kmessage",
  "events": ["message.delivered", "message.read", "message.failed"],
  "headers": { "X-Internal-Auth": "..." }
}

Field	Notes
name	Required. For your own records.
url	Required. Public http or https. Private and internal addresses are refused.
events	Required, at least one. Unknown names are rejected.
headers	Optional extra headers sent with every delivery.
secret	Optional. One is generated if you do not supply it.
is_active	Defaults to true.

201

{
  "id": "2b3c4d5e-...",
  "name": "Order updates",
  "url": "https://api.example.com/hooks/kmessage",
  "events": ["message.delivered", "message.read", "message.failed"],
  "is_active": true,
  "secret": "9f8e7d6c5b4a39281706f5e4d3c2b1a0",
  "created_at": "2026-08-20T10:00:00Z"
}

The secret appears only here. It is what your endpoint uses to verify that a delivery came from us, and returning it on every read would put it in every log and cache that ever touched the endpoint. Store it now. See Verify webhook signatures.

An unknown event name is refused rather than ignored, because a webhook that looks correctly configured and never fires is indistinguishable from a broken delivery pipeline.

PUT /v1/webhooks/{id}

Scope: webhooks:write

Partial: fields you omit are unchanged. Sending secret rotates it.

events cannot be set to an empty array. Set is_active to false to stop deliveries; an endpoint subscribed to nothing is one that exists, looks configured, and can never fire.

POST /v1/webhooks/{id}/test

Sends a sample test event and reports what your endpoint said.

Scope: webhooks:write

200

{
  "delivered": false,
  "status_code": 500,
  "duration_ms": 84,
  "delivery_id": "8f3a1c2d-...",
  "response_body": "Internal Server Error",
  "error": "webhook returned non-2xx status: Internal Server Error"
}

The HTTP status is 200 even when your endpoint fails. The request to us succeeded; it was your server that answered 500, and conflating the two would lose the one fact you need.

Test deliveries appear in the history below, like any other.

GET /v1/webhooks/{id}/deliveries

Recent attempts, newest first.

Scope: webhooks:read

Query	Notes
event	Restrict to one event type
limit	1 to 200, default 50

200

{
  "data": [
    {
      "id": "1a2b3c4d-...",
      "delivery_id": "8f3a1c2d-...",
      "event": "message.delivered",
      "attempt": 2,
      "status_code": 200,
      "success": true,
      "duration_ms": 112,
      "request_body": "{\"event\":\"message.delivered\",...}",
      "response_body": "ok",
      "created_at": "2026-08-20T09:15:04Z"
    }
  ],
  "has_more": false
}

Every attempt is recorded, including retries, with the exact payload we sent and what your server replied. History is kept for 7 days.

This is the first place to look when something did not arrive. All attempts for one event share a delivery_id, so a retry can be told apart from a genuinely duplicate event. A status_code of 0 means the request never completed: DNS failure, timeout, or a refused connection.

GET /v1/webhooks · DELETE /v1/webhooks/{id}

List and delete. Delete returns 204.