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

{
  "links": {
    "self": "https://api.vantage.sh/v2/billing_rules",
    "first": "https://api.vantage.sh/v2/billing_rules?page=1",
    "next": null,
    "last": "https://api.vantage.sh/v2/billing_rules?page=1",
    "prev": null
  },
  "billing_rules": [
    {
      "token": "bllng_rule_ac6852c686e265a1",
      "title": "Exclude Reserved Instance Fees",
      "type": "Exclusion",
      "created_by_token": "usr_018532419bd2e1da",
      "created_at": "2024-07-02T15:26:51Z",
      "charge_type": "Reserved Instance Fees"
    }
  ]
}