subscription.past_due

When this fires

A scheduled charge fails but the subscription remains within its grace window. The platform will continue to attempt collection.

Required ability

project-subscription:view-any — token must carry this at mint time to subscribe an endpoint to this event.

Payload

{
  "id": "evt_01HX...",
  "type": "subscription.past_due",
  "created_at": "2026-06-18T10:05:00Z",
  "api_version": "2026-05-01",
  "project_id": "prj_01HX...",
  "data": {
    "subscription_id": "sub_01HX...",
    "plan_id": "pln_01HX...",
    "subscriber_id": "usr_01HX...",
    "provider": "stripe",
    "external_payment_id": "pi_3Nxy.."
  }
}

Field reference

Field	Type	Notes
`id`	string ULID	Unique event id, prefixed `evt_`. Use for idempotent processing.
`type`	string	Always `subscription.past_due` for this event.
`created_at`	ISO 8601 timestamp	Server-side emission time.
`api_version`	string	Webhook API contract version.
`project_id`	string ULID	Project this event belongs to.
`data.subscription_id`	string ULID	Subscription identifier.
`data.plan_id`	string ULID	Plan the subscription is on.
`data.subscriber_id`	string ULID	Subscriber's project-scoped user id.
`data.provider`	string	Payment provider slug.
`data.external_payment_id`	string	Provider charge id for the failed attempt; useful for support escalation.

Caveats

Pairs with a payment.failed event for the underlying charge.
If retries succeed, subscription.renewed follows. If grace expires, subscription.unpaid fires instead.

payment.failed — paired payment event.
subscription.unpaid — grace-window terminal state.
Subscription events overview — back to family overview.