sequence.* events

One step of a recovery sequence reached a member.

When this fires

The hourly sweep found the step due and the member's connected account took the message: the creator's text with the placeholders filled for this member, the way back to the project as a button, and the step's coupon code in the text where the creator placed it. The message goes out as an announcement, so the member's channel choices and opt-outs apply. A platform that refuses for the moment (a rate limit, a passing fault, a misconfigured installation) fires nothing and the step stays due for the next hour; one that refuses for good, or a member with no account to reach, fires nothing and ends the passage as sequence.exited with the reason opted_out. After the last step the passage completes quietly: no event marks completion.

Related events

  • sequence.enrolled: the passage this step belongs to.
  • sequence.converted: the member paid again after reading it.
  • coupon.redeemed: the step's coupon used at checkout.
postWebhooksequence.step_sent

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'sequence.step_sent' required

The event name, always sequence.step_sent 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.