Event registration cancelled

Fires when an RSVP or registration is withdrawn.


Event	`event.registration.cancelled`
Code	306
Group	Events (300)
Since	2026-10-21

Select the event event.registration.cancelled or the whole Events group on your endpoint. Filters:

spaceIds: community-level event, always delivered whatever the spaces filter.

itemTypes: online, in_person, hybrid.

`data` fields

Field	Type	Always present
`registration`	WebhookRegistration	✅ Yes

Sample delivery

{
  "event": "event.registration.cancelled",
  "timeStamp": 1792600000000,
  "data": {
    "registration": {
      "id": "00000000-0000-4000-8000-000000000007",
      "event": {
        "id": "00000000-0000-4000-8000-000000000006",
        "title": "Monthly meetup",
        "start": "2026-10-21T10:00:00.000Z",
        "url": "https://community.example.com/events/00000000-0000-4000-8000-000000000006"
      },
      "registrant": {
        "id": "00000000-0000-4000-8000-000000000001",
        "name": "Ada Example",
        "email": "ada@example.com",
        "role": "Member",
        "profileUrl": "https://community.example.com/profile/00000000-0000-4000-8000-000000000001",
        "avatarUrl": "https://community.example.com/avatars/ada.png"
      },
      "response": "going",
      "source": "rsvp",
      "answers": null,
      "purchaseId": null
    }
  },
  "id": "evt_8f2b1c3d-4e5f-4a6b-9c7d-0e1f2a3b4c5d",
  "code": 306,
  "group": "events",
  "version": "2026-10-21",
  "communityId": "64f1c0ffee0000000000c0de",
  "occurredAt": "2026-10-21T15:00:00.000Z",
  "attempt": 1,
  "isTest": false
}

Handling

Verify x-networked-signature against the raw body before you trust the request.

Answer any 2xx within 10 seconds and process the event afterwards.

Deduplicate on id: retries and resends carry the same id.

Ignore keys and event types you do not handle; keys may be added, never removed or renamed.

curl --location 'https://your-api-server.com' \ --header 'x-networked-signature: t=1792600000,v1=5f1a…' \ --header 'x-networked-event: event.registration.cancelled' \ --header 'x-networked-event-id: evt_8f2b1c3d-4e5f-4a6b-9c7d-0e1f2a3b4c5d' \ --header 'x-networked-event-code: 306' \ --header 'x-networked-delivery-id: dlv_2c9e1a7b-3f4d-4b5e-8a6c-7d8e9f0a1b2c' \ --header 'x-webhook-signature: 9a3c…' \ --header 'x-webhook-timestamp: 1792600000000' \ --header 'Content-Type: application/json' \ --data-raw '{ "event": "event.registration.cancelled", "timeStamp": 1792600000000, "data": { "registration": { "id": "00000000-0000-4000-8000-000000000007", "event": { "id": "00000000-0000-4000-8000-000000000006", "title": "Monthly meetup", "start": "2026-10-21T10:00:00.000Z", "url": "https://community.example.com/events/00000000-0000-4000-8000-000000000006" }, "registrant": { "id": "00000000-0000-4000-8000-000000000001", "name": "Ada Example", "email": "ada@example.com", "role": "Member", "profileUrl": "https://community.example.com/profile/00000000-0000-4000-8000-000000000001", "avatarUrl": "https://community.example.com/avatars/ada.png" }, "response": "going", "source": "rsvp", "answers": null, "purchaseId": null } }, "id": "evt_8f2b1c3d-4e5f-4a6b-9c7d-0e1f2a3b4c5d", "code": 306, "group": "events", "version": "2026-10-21", "communityId": "64f1c0ffee0000000000c0de", "occurredAt": "2026-10-21T15:00:00.000Z", "attempt": 1, "isTest": false }'

Event registration cancelled