import CheckoutIntents from 'checkout-intents';

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

const response = await client.billing.createTopupInvoice({ amountSubunits: 500000 });

console.log(response.id);

{
  "bankTransferDetails": {
    "routingNumber": "<string>",
    "accountNumber": "<string>",
    "bankName": "<string>",
    "accountHolderName": "<string>"
  },
  "url": "https://invoice.stripe.com/i/acct_xxx/test_xxx",
  "amount": {
    "currencyCode": "USD",
    "amountSubunits": 1500
  },
  "id": "in_abc123"
}