`member.created`

Member record created successfully

When Emitted

Emitted when POST /v1/members actually creates a member row and returns 201. An idempotent hit, where the same external_member_id already exists and the response is 200, does not emit it; otherwise every registration retry would generate another “new member” notification. ⚠ status_version is always 0: member rows have no state-machine version. This event is emitted once per member, so there is no second occurrence to arrive out of order.

Payload

{
  "event_id": "evt_2f1c8a9b4d7e4c1fa0b3e5d6c7a8b901",
  "event_type": "member.created",
  "created_at": "2026-08-12T09:30:00Z",
  "merchant_id": "acme",
  "livemode": true,
  "data": {
    "object": "member",
    "id": "4b7c1e02-9a3d-4f18-8c55-2d61ab0f9e77",
    "external_member_id": "u_88123",
    "status": "normal",
    "status_version": 0
  }
}

Payload Fields

Field	Type	Description
`id`	string	Use this for deduplication. `evt_…` remains unchanged when the same event is redelivered.
`type`	string	Always `member.created`
`created_at`	string	Time the event was created (RFC3339), not its delivery time. It is unchanged on redelivery.
`data.object`	string	Object type; determines which endpoint to query with `data.id`
`data.id`	string	Object ID; use it to retrieve details.
`data.status`	string	Treat unrecognized values as unknown and raise an alert; do not fall back to “processing”
`data.status_version`	number	Monotonically increasing; use it to discard older states that arrive late.

Signature Verification and Deduplication

Verify the signature against the raw request body bytes. Do not parse and reserialize the JSON: your JSON library may change key order or whitespace, which changes the signature and can look like a key configuration error.

// Node · Run before parsing JSON
const raw = await readRawBody(req);            // Buffer / string; do not use parsed req.body
const expect = crypto.createHmac("sha256", WEBHOOK_SECRET).update(raw).digest("hex");
const got = req.headers["z-signature"];        // Format: t=<unix>,v1=<hex>
if (!timingSafeEqual(expect, parseV1(got))) return res.status(400).end();

// Deduplicate using the envelope id, not data.id
if (await seen(JSON.parse(raw).id)) return res.status(200).end();

For the full procedure, including timestamp tolerance and redelivery semantics, see Webhook Guide.