import Telnyx from 'telnyx';

const client = new Telnyx({
  apiKey: 'My API Key',
});

const response = await client.legacy.reporting.batchDetailRecords.voice.retrieveFields();

console.log(response.Billing);

{
  "Interaction Data": [
    "origination_number",
    "terminating_number",
    "start_timestamp_utc",
    "start_timestamp",
    "answer_timestamp",
    "end_timestamp",
    "direction"
  ],
  "Number Information": [
    "origination_city",
    "origination_state",
    "origination_lata",
    "origination_country",
    "terminating_city",
    "terminating_state"
  ],
  "Telephony Data": [
    "route",
    "connection_id",
    "hangup_code",
    "pdd",
    "tags",
    "sip_call_id",
    "mos"
  ],
  "Billing": [
    "billable_time",
    "cost",
    "rate",
    "billing_group_id"
  ]
}