[
  {
    "id": "<string>",
    "email": "jsmith@example.com",
    "source": "<string>",
    "subscribed": true,
    "mailingLists": {},
    "createdAt": "2023-11-07T05:31:56Z",
    "updatedAt": "2023-11-07T05:31:56Z",
    "firstName": "<string>",
    "lastName": "<string>",
    "userId": "<string>"
  }
]

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "details": null
  }
}