Fired when subscription details change, including when a cancellation is scheduled.

Payload

All webhook payloads follow a consistent top-level structure with event-specific data nested within the data object.

subscriptionIdstring

The subscription ID.

customerIdstring

The customer ID. Returns your externalId if you provided one when creating the customer, otherwise returns the Commet publicId.

statusstring

Current status. When cancellation is scheduled, this is still "active" — the subscription remains usable until endDate.

canceledAtstring | null

ISO 8601 datetime when cancellation was requested. Present when cancellation is scheduled, null otherwise.

cancelReasonstring | null

The reason for cancellation, if provided.

endDatestring | null

ISO 8601 datetime when the subscription will end. Present when cancellation is scheduled — this is the date access should be revoked (via subscription.canceled).

{
  "event": "subscription.updated",
  "timestamp": "2026-04-20T10:15:00.000Z",
  "organizationId": "org_abc123",
  "mode": "live",
  "apiVersion": "2026-05-25",
  "data": {
    "subscriptionId": "sub_1a2b3c4d",
    "customerId": "user_123",
    "status": "active",
    "canceledAt": "2026-04-20T10:15:00.000Z",
    "cancelReason": "Too expensive",
    "endDate": "2026-04-25T00:00:00.000Z"
  }
}

Detecting scheduled cancellation

When a customer cancels, subscription.updated fires with status: "active" but canceledAt and endDate set. This tells you the subscription is still usable but ending soon. Show a notice like "your subscription will end on {endDate}" in your UI.

Access should only be revoked when you receive subscription.canceled (status: "canceled").