curl --request GET \
  --url https://api.stack-auth.com/api/v1/emails/notification-preference/{user_id}

{
  "items": [
    {
      "notification_category_id": "<string>",
      "notification_category_name": "<string>",
      "enabled": true,
      "can_disable": true
    }
  ],
  "pagination": {
    "next_cursor": "b3d396b8-c574-4c80-97b3-50031675ceb2"
  }
}