subscription.* events

Trial about to convert. Fires 24h before `trial_ends_at`.

When this fires

Fires 24 hours before trial_ends_at to give consumers a window to send conversion-reminder messaging. Emitted once per trial, by the hourly trial-conversion notifier.

Fires exactly once per trial, 24 hours before trial_ends_at.

Caveats

  • Idempotency is enforced server-side: each trial receives this event at most once.
  • If trial_ends_at is moved closer than 24h after the trial has already started, the notice may not fire.

Related events

  • subscription.trial_started: predecessor.
  • subscription.activated, member.converted: fire on successful conversion.
  • subscription.trial_expired: alternative path if conversion fails.
postWebhooksubscription.trial_converting

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'subscription.trial_converting' required

The event name, always subscription.trial_converting 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.