plan.updated

When this fires

A creator edits an existing plan — pricing, name, trial length, billing cadence, eligibility filters. Active-flag transitions emit dedicated plan.activated / plan.deactivated events instead.

Required ability

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

Payload

{
  "id": "evt_01HX...",
  "type": "plan.updated",
  "created_at": "2026-05-18T10:05:00Z",
  "api_version": "2026-05-01",
  "project_id": "prj_01HX...",
  "data": {
    "plan": {
      "id": "pln_01HX...",
      "name": "Premium Monthly",
      "price": 29.0,
      "currency": "USD",
      "billing_cycle": "monthly",
      "trial_days": 7,
      "active": true
    },
    "changes": {
      "price": { "from": 25.0, "to": 29.0 }
    }
  }
}

Field reference

Field	Type	Notes
`id`	string ULID	Unique event id, prefixed `evt_`. Use for idempotent processing.
`type`	string	Always `plan.updated` 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.plan`	object	Full post-update plan snapshot (same shape as `plan.created`).
`data.changes`	`object<string, {from,to}>`	Map of fields that changed. Keys are plan attributes; values are before/after pairs.

Caveats

Existing subscriptions priced on the old terms are not retroactively re-priced. New checkouts use the new price; renewals follow the rules described billing docs.
Active-flag transitions emit plan.activated and plan.deactivated instead of plan.updated.

plan.activated, plan.deactivated — dedicated active-flag events.
plan.sync_completed — fires after price changes propagate to the PSP catalog.
Plan events overview — back to family overview.