subscription.* events

A cancelling member took the offer the cancellation screen made.

When this fires

A member on the cancellation screen accepted the one offer the project makes for their rail: a pause for one billing cycle where the rail can hold the charge (Stripe, PayPal), a discount on the renewals where the rail can carry a coupon (Stripe), or a coupon to come back with everywhere else. A pause holds the charge at the gateway and pauses access, and the hourly sweep lets the member back in when resumes_at passes; a discount is minted once at the gateway and applied to the subscription; a return coupon is handed to the member on the screen and in a chat message, and the cancellation goes on. The offer is re-derived when the member accepts, so a stale screen cannot claim an offer the project no longer makes.

Caveats

  • A pause taken here keeps the subscription: it reads as paused until resumes_at, and no subscription.cancelled follows. A return coupon does not: the cancellation goes on and subscription.cancelled fires as usual.
  • A member sees one offer per cancellation. Declining it fires nothing; the shown offer is still counted on the cancellation record.

Related events

  • subscription.cancellation_feedback: the reason recorded just before.
  • subscription.paused / subscription.unpaused: the pause's two ends.
  • coupon.redeemed: a return coupon used at checkout.
postWebhooksubscription.offer_taken

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.offer_taken' required

The event name, always subscription.offer_taken 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.