billing.grace_period_warning

project_id is always null for billing events. Fires once per past-due cycle.

When this fires

The creator's account reaches the warning milestone on its overdue clock. That milestone depends on the plan's base price: day 3 for a creator on a zero-base-price (Free) plan, whose lockdown lands on day 7, and day 23 for a paid plan, whose lockdown lands on day 30.

Read days_until_lockdown from the payload rather than assuming a fixed offset — it carries the actual remaining days for that creator's tier.

Required ability

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

Payload

{
  "id": "evt_01HX...",
  "type": "billing.grace_period_warning",
  "created_at": "2026-05-11T08:00:00Z",
  "api_version": "2026-05-01",
  "project_id": null,
  "data": {
    "creator_id": "2a91c4e7-6f38-4b52-8e0d-9c1a7b3f5d80",
    "past_due_since": "2026-04-18T00:00:00Z",
    "days_until_lockdown": 7
  }
}

Field reference

Field	Type	Notes
`id`	string ULID	Unique event id, prefixed `evt_`. Use for idempotent processing.
`type`	string	Always `billing.grace_period_warning` 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 UUID	Creator approaching lockdown.
`data.past_due_since`	ISO 8601 timestamp	When the past-due state began.
`data.days_until_lockdown`	integer	Whole days from emission until lockdown for this creator's tier. Typically `7` on a paid tier and `4` on Free or an unconverted trial; lower if the daily sweep is late, and `0` at the floor.

Caveats

Each past-due cycle produces at most one billing.grace_period_warning. If the account recovers and re-enters past_due later, a new cycle and a new warning may issue.
After lockdown the clock keeps running: a deletion warning at 53 days locked and account deletion at 60 days locked on paid/trial thresholds (3 and 7 days on Free). Neither stage emits a billing.* webhook — they surface as notifications only.

billing.payment_failed — the chain of failed collections leading here.
billing.account_locked — fires when the lockdown day arrives: 7 days after this event on a paid tier, 4 on Free or an unconverted trial.
Billing events overview — back to family overview.