import Telnyx from 'telnyx';

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

const simCardGroup = await client.simCardGroups.create({ name: 'My Test Group' });

console.log(simCardGroup.data);

{
  "data": {
    "id": "6a09cdc3-8948-47f0-aa62-74ac943d6c58",
    "record_type": "sim_card_group",
    "default": true,
    "name": "My Test Group",
    "data_limit": {
      "amount": "2048.1",
      "unit": "MB"
    },
    "consumed_data": {
      "unit": "MB",
      "amount": "2048.1"
    },
    "private_wireless_gateway_id": "6a09cdc3-8948-47f0-aa62-74ac943d6c58",
    "wireless_blocklist_id": "a13bc415-7966-43bf-90d4-63cc76275289",
    "created_at": "2018-02-02T22:25:27.521Z",
    "updated_at": "2018-02-02T22:25:27.521Z"
  }
}