import Whopsdk from 'whopsdk';

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

const checkoutConfiguration = await client.checkoutConfigurations.retrieve('ch_xxxxxxxxxxxxxxx');

console.log(checkoutConfiguration.id);

{
  "id": "ch_xxxxxxxxxxxxxxx",
  "company_id": "<string>",
  "plan": {
    "id": "plan_xxxxxxxxxxxxx",
    "visibility": "visible",
    "plan_type": "renewal",
    "release_method": "buy_now",
    "currency": "usd",
    "billing_period": 42,
    "expiration_days": 42,
    "initial_price": 6.9,
    "renewal_price": 6.9,
    "trial_period_days": 42
  },
  "affiliate_code": "<string>",
  "metadata": {},
  "redirect_url": "<string>",
  "purchase_url": "<string>"
}