# campaign_participant.joined

A creator joined a campaign from their invite link or the open link.

### When it fires

It fires once per participant, and `participant.joinedAt` says when.




**Payload for `campaign_participant.joined`:**

- **id** (required) `string`: Stable webhook event ID: the dedupe key, also sent as the X-Zernio-Event-Id header and identical on every retry and redelivery. It identifies the event only, never an account or other resource.
- **profiles**: `WebhookProfiles` - See schema definition
- **test** `boolean`: Always true when present: only a sample sent by POST /v1/webhooks/test with an event carries it. Real deliveries never do.
- **event** (required) `string`: No description - one of: campaign_participant.joined, campaign_participant.suspended, campaign_participant.removed
- **campaign** (required) `object`: 
  - **id** (required) `string`: No description
  - **name** (required) `string`: No description
- **participant** (required) `object`: 
  - **id** (required) `string`: No description
  - **status** (required) `string`: No description - one of: invited, active, suspended, removed
  - **joinedAt** (required) `string,null` (date-time): No description
- **creator** (required) `object`: 
  - **id** (required) `string`: No description
  - **displayName** (required) `string`: No description
- **timestamp** (required) `string` (date-time): UTC time at which Zernio generated this event (set once when the event payload is built, before delivery is queued). Retries and redeliveries keep the original value, so it reflects the event, not the delivery attempt.