curl -X GET 'https://api.nuntly.com/organizations/apk_01ka8k8s80gvx9604cn9am5st4/usage' \
  -H 'Authorization: Bearer apk_xxx'

{
  "data": {
    "transactional": {
      "limits": {
        "daily": 123,
        "monthly": 123
      },
      "usage": {
        "daily": 123,
        "monthly": 123
      },
      "sending": {
        "daily": 123,
        "monthly": 123
      },
      "receiving": {
        "daily": 123,
        "monthly": 123
      }
    }
  }
}