plan.* events

Any mutable plan field changes.

When this fires

A plan is edited through the REST API (PATCH /v1/projects/{project}/plans/{plan}): pricing, name, currency, billing cadence, eligibility filters. Edits made in the creator dashboard do not emit this event, and trial fields are only written (and only then reported) when the payload also carries kind. An active flag sent on a PATCH is reported here as an ordinary changes.active entry. The dedicated plan.activated and plan.deactivated events come only from the publish and unpublish endpoints.

Caveats

  • Existing subscriptions priced on the old terms are not retroactively re-priced. New checkouts use the new price; renewals follow the billing rules.
  • An active flag sent on a PATCH is reported here as an ordinary changes.active entry. The dedicated plan.activated and plan.deactivated events come only from the publish and unpublish endpoints.

Related events

  • plan.activated, plan.deactivated: dedicated active-flag events.
  • plan.sync_completed: fires after price changes propagate to the provider catalog.
postWebhookplan.updated

Headers

SB-Signaturestring required

t=<unix seconds>,v1=<hex>: the HMAC-SHA256 of "<t>.<raw body>" under the endpoint's secret. Verify it before acting, and refuse a t more than 300 seconds from now. During a secret rotation a v0= signature under the previous secret may precede v1=.

SB-Event-Idstring required

The event's ULID, bare. The envelope's id is the same ULID prefixed evt_, so strip the prefix before comparing. Deduplicate on it: a retry carries the same id.

SB-Event-Namestring required

The event name, the same as the envelope's type.

Content-Typestring required

Always application/json.

User-Agentstring required

Always Subscriby-Webhooks/1.0.

Payload

idstring required

A ULID unique to the event, prefixed evt_. Every retry carries the same id, so it is the key to deduplicate on.

type'plan.updated' required

The event name, always plan.updated here.

created_atstring date-time required

When the event was emitted, server time, ISO 8601.

api_versionstring required

The contract version of the payload shape, 2026-05-01 today. A breaking change to a shape ships under a new version.

project_idstring uuid nullable required

The project the event belongs to; null for team-scoped and billing events.

Response

Your endpoint acknowledged the delivery. Any 2xx status within 30 seconds marks it delivered; the response body is ignored.

Changes

Webhooks have no change history: a webhook is keyed by its event name rather than a path and method, so no recorded change can name it.