listing.cancelled

A listing was cancelled via API or dashboard

Category: Listing Lifecycle

Emitted when: After cancel_tour router commits the cancellation

Envelope

Every delivery wraps the event-specific data block in the canonical envelope documented on the webhook overview page. The body carries SIX keys; the HMAC signature is delivered as the X-Webhook-Signature request header on the inbound POST to your endpoint (NOT as a body field; including it in the body would make the HMAC a function of its own output).

Field	Type	Description
event_id	string	ULID; globally unique. Safe to persist as the dedup key.
event_type	string	Always listing.cancelled for this event.
api_version	string	Payload schema version (YYYY-MM-DD).
timestamp	integer	Unix epoch seconds at dispatch time.
nonce	string	ULID; unique per delivery, used for replay rejection.
data	object	Event-specific payload (see below).

Delivery also sets three HTTP headers on the inbound POST:

Header	Meaning
X-Webhook-Event-Id	Mirrors event_id; cheaper than parsing the body to dedup.
X-Webhook-Timestamp	Mirrors timestamp for replay-window checks.
X-Webhook-Signature	sha256=<hex> HMAC over timestamp.body.

Data schema

Field	Type	Required	Description
agency_id	string	yes	Agency Id
listing_number	string	yes	Public listing number, 7-char lowercase nanoid ([a-z0-9]{7})
reason	string | null	no	Free-form cancellation reason. Populated from the cancel request body; None is supported on the wire but the request handler enforces non-empty in practice.
fee_applied	unknown	yes	Cancellation fee that was charged. amount=0 when no fee applied (outside fee window or fees disabled).
cancelled_by	string	yes	Actor token: 'apikey:' for API calls, 'user:' for dashboard
source	"api" | "dashboard"	yes	Source
calendar_events_removed	integer	yes	Count of Google Calendar events successfully deleted during cancellation. Best-effort; failures do not roll back. StrictInt prevents a bool (True == 1) from leaking in.

Sample payload

The sample below is a live fixture. Feed the exact body bytes shown plus the timestamp into the HMAC-SHA256 recipe from the webhook overview using the documented test-vector secret (test_secret_001 ) and you will recover the signature header value printed below.

Body (delivered as the HTTP request body):

{
  "event_id": "evt_0B58MH9CZTS24JKSF0TZ1YA180",
  "event_type": "listing.cancelled",
  "api_version": "2026-04-17",
  "timestamp": 1745339401,
  "nonce": "39BVSZD0NGC942WNK476VQW5V1",
  "data": {
    "agency_id": "user_01HXAGENCY0000000000000",
    "listing_number": "abc1234",
    "reason": "agency_request",
    "fee_applied": null,
    "cancelled_by": "apikey:key_01HXAPIKEY000000000000",
    "source": "api",
    "calendar_events_removed": 0
  }
}

Signature header (delivered as X-Webhook-Signature on the same request):

sha256=175137c506be635122dbda07afced05cf64118d6aca8dd2ae1202a99bd6cdda6

Retry behaviour

Failed deliveries retry on the sequence 2, 4, 8, 16, 32 seconds (five attempts plus the initial call for a total of six over approximately 62 seconds of wall clock). After the final attempt the delivery lands in the dead-letter queue and the dashboard operator can replay it from Settings > API Keys > Webhook Endpoint > Deliveries. See the webhook overview for the full rules.

Verification

Every receiver MUST verify the X-Webhook-Signature header using the recipe in the webhook overview. Rejecting deliveries whose timestamp is more than 5 minutes off your wall clock (after NTP correction on your side) or whose nonce has already been consumed in the last 10 minutes is part of the contract.