Get Order's Order Group

curl 'http://localhost:9000/admin/orders/order_01HXYZ8Q2M4N6P8R0T2V4W6X8Y/order-group' \
  -H 'Authorization: Bearer <token>'

const { order_group } = await client.admin.orders.$id.orderGroup.query({
  $id: "order_01HXYZ8Q2M4N6P8R0T2V4W6X8Y",
})

{
  "order_group": {
    "id": "og_01HXYZ8Q2M4N6P8R0T2V4W6X8Y",
    "customer_id": "cus_01HXYZ",
    "seller_count": 2,
    "total": 7400,
    "created_at": "2026-06-01T10:00:00.000Z",
    "updated_at": "2026-06-01T10:00:00.000Z"
  }
}