billing.tier_cancelled

project_id is always null for billing events.

When this fires

The creator cancels their MemberPass tier subscription. The account remains usable until the current period ends.

Required ability

billing:read — token must carry this at mint time to subscribe an endpoint to this event.

Payload

{
  "id": "evt_01HX...",
  "type": "billing.tier_cancelled",
  "created_at": "2026-05-18T10:05:00Z",
  "api_version": "2026-05-01",
  "project_id": null,
  "data": {
    "creator_id": "cre_01HX...",
    "plan_id": "tier_growth",
    "effective_at": "2026-06-18T00:00:00Z"
  }
}

Field reference

Field	Type	Notes
`id`	string ULID	Unique event id, prefixed `evt_`. Use for idempotent processing.
`type`	string	Always `billing.tier_cancelled` for this event.
`created_at`	ISO 8601 timestamp	Server-side emission time.
`api_version`	string	Webhook API contract version.
`project_id`	null	Always `null` — account-level event.
`data.creator_id`	string ULID	Creator who cancelled.
`data.plan_id`	string	Tier plan id at cancellation time.
`data.effective_at`	ISO 8601 timestamp	When the cancellation takes effect (typically end of paid period).

Caveats

Cancellation does not refund the active period — there is a no-refunds policy on creator tier billing.
The account does not auto-lock at effective_at unless past_due conditions also apply; it gracefully drops to the Free tier feature set.

billing.tier_downgraded — alternative path that retains paid features.
billing.invoice_paid — last paid invoice before cancellation.
Billing events overview — back to family overview.