import Telnyx from 'telnyx';

const client = new Telnyx({
  apiKey: process.env['TELNYX_API_KEY'], // This is the default and can be omitted
});

const invoice = await client.invoices.retrieve('182bd5e5-6e1a-4fe4-a799-aa6d9a6ab26e');

console.log(invoice.data);

{
  "data": {
    "invoice_id": "48eff763-ea80-4345-b688-78249eb165a8",
    "file_id": "454ea3b0-9eaa-4fa9-992e-6d9f31c0a37e",
    "period_start": "2023-11-01",
    "period_end": "2023-11-30",
    "paid": true,
    "url": "https://api.telnyx.com:443/v2/invoices/48eff763-ea80-4345-b688-78249eb165a8",
    "download_url": "https://us-east-1.telnyxstorage.com/porting-documents/telnyx/..."
  }
}