curl --request GET \
  --url https://api.petrasecurity.com/v1/billable-users \
  --header 'Authorization: Bearer <token>'

{
  "tenantId": "petra-tenant-123",
  "tenantDisplayName": "Acme Corporation",
  "microsoftTenantId": "abcd1234-5678-90ef-ghij-klmnopqrstuv",
  "reportGeneratedAt": "2026-01-06T12:00:00.000Z",
  "totalBillableUsers": 42,
  "projectedBillableUnitsThisMonth": 28,
  "users": [
    {
      "id": "user-id-1",
      "displayName": "John Doe",
      "userPrincipalName": "john.doe@example.com",
      "mail": "john.doe@example.com",
      "accountEnabled": true,
      "assignedLicenseSkuIds": [
        "sku-id-1",
        "sku-id-2"
      ]
    }
  ]
}