{
  "user_id": "user123@example.com",
  "items": [
    {
      "product_id": "user_user0_example_com_fa373486",
      "quantity": 1,
      "selected_specifications": {},
      "added_at": "2025-09-09T03:32:30.573242755Z",
      "updated_at": "2025-09-09T03:32:30.573242755Z"
    }
  ],
  "session_id": null,
  "created_at": "2025-09-09T03:32:30.573133861Z",
  "updated_at": "2025-09-09T03:32:30.573271484Z"
}