Receive a perkstar outbound event

{
  "id": "whd_01JEXAMPLE",
  "type": "transaction.created",
  "created": 1785312000,
  "orgId": "org_123",
  "data": {
    "transactionId": "txn_123",
    "enrollmentId": "enr_123",
    "cardId": "card_123",
    "type": "STAMP",
    "delta": 1,
    "balanceAfter": 6,
    "occurredAt": "2026-07-30T10:00:00.000Z"
  }
}