import Telnyx from 'telnyx';

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

const phoneNumberExtensions = await client.portingOrders.phoneNumberExtensions.list(
  '182bd5e5-6e1a-4fe4-a799-aa6d9a6ab26e',
);

console.log(phoneNumberExtensions.data);

{
  "data": [
    {
      "id": "f24151b6-3389-41d3-8747-7dd8c681e5e2",
      "porting_phone_number_id": "f24151b6-3389-41d3-8747-7dd8c681e5e2",
      "extension_range": {
        "start_at": 1,
        "end_at": 10
      },
      "activation_ranges": [
        {
          "start_at": 1,
          "end_at": 10
        }
      ],
      "record_type": "porting_phone_number_extension",
      "created_at": "2021-03-19T10:07:15.527Z",
      "updated_at": "2021-03-19T10:07:15.527Z"
    }
  ],
  "meta": {
    "page_number": 2,
    "page_size": 25,
    "total_pages": 3,
    "total_results": 55
  }
}