curl --request GET \
  --url https://api.vantage.sh/v2/report_notifications \
  --header 'Authorization: Bearer <token>'

{
  "links": {
    "self": "https://api.vantage.sh/v2/report_notifications",
    "first": "https://api.vantage.sh/v2/report_notifications?page=1",
    "next": null,
    "last": "https://api.vantage.sh/v2/report_notifications?page=1",
    "prev": null
  },
  "report_notifications": [
    {
      "token": "rprt_ntfctn_7c09ca27d07d8d1e",
      "title": "Test Notification",
      "cost_report_token": "rprt_ba0a5a5201390d72",
      "user_tokens": [
        "usr_27edb13f3beac3cb"
      ],
      "frequency": "weekly",
      "change": "percentage"
    }
  ]
}