curl --request POST \
  --url https://fees.sandbox.lerian.net/v1/billing/calculate \
  --header 'Content-Type: <content-type>' \
  --header 'X-Organization-Id: <x-organization-id>' \
  --data '
{
  "ledgerId": "ldg_01HZ...",
  "period": "2026-03",
  "type": "volume"
}
'

{
  "results": [
    {
      "billingPackageId": "<string>",
      "billingPackageLabel": "<string>",
      "billingType": "volume",
      "period": "<string>",
      "totalAccounts": 123,
      "totalCharged": 123,
      "totalSkipped": 123,
      "totalNetAmount": "<string>",
      "transactionPayload": {}
    }
  ],
  "summary": {
    "totalResults": 123,
    "totalVolume": 123,
    "totalMaintenance": 123,
    "totalNetAmount": "<string>"
  }
}