{
  "data": {
    "id": 123,
    "email": "customer@example.com",
    "name": "王小明",
    "phone": "0912345678",
    "metadata": {
      "source": "website"
    },
    "ltv": "0.00",
    "order_count": 0,
    "first_payment_at": null,
    "last_payment_at": null,
    "created_at": "2026-01-09T08:00:00Z",
    "updated_at": "2026-01-09T08:00:00Z"
  }
}

{
  "message": "Unauthenticated."
}

{
  "message": "The given data was invalid.",
  "errors": {
    "email": [
      "The email field is required.",
      "The email must be a valid email address."
    ]
  }
}

{
  "message": "Too Many Requests",
  "retry_after": 3600
}