member.trial_joined

Always follows subscription.trial_started.

When this fires

A subscriber joins the project under a trial — typically through a cardless trial or a paid checkout that began with a trial window.

Required ability

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

Payload

{
  "id": "evt_01HX...",
  "type": "member.trial_joined",
  "created_at": "2026-05-18T10:05:00Z",
  "api_version": "2026-05-01",
  "project_id": "prj_01HX...",
  "data": {
    "subscription_id": "sub_01HX...",
    "plan_id": "pln_01HX...",
    "subscriber_id": "usr_01HX...",
    "project_id": "prj_01HX...",
    "access_code": null
  }
}

Field reference

Field	Type	Notes
`id`	string ULID	Unique event id, prefixed `evt_`. Use for idempotent processing.
`type`	string	Always `member.trial_joined` 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.subscription_id`	string ULID	Subscription that triggered the join.
`data.plan_id`	string ULID	Plan the subscription is on.
`data.subscriber_id`	string ULID	Subscriber's project-scoped user id.
`data.project_id`	string ULID	Mirrors top-level `project_id`.
`data.access_code`	string \| null	Masked code when the trial was redemption-driven.

Caveats

A trial-joined member becomes a paid member.converted if the trial converts; otherwise they roll into member.churned once the trial expires.

subscription.trial_started — always precedes.
member.converted — fires on successful trial conversion.
Member events overview — back to family overview.