Buying a name with a credit card (fiat / Stripe)

getArNSFiatPurchaseQuote prices a purchase in fiat and returns a Stripe payment session, so a user can buy a name without holding credits first.

const quote = await turbo.getArNSFiatPurchaseQuote({
  name: 'my-name',
  intent: 'Buy-Name',
  type: 'lease',
  years: 1,
  currency: 'usd',
});

Its paymentAmount is the real charge and already includes the ANT spawn surcharge. (On the getArNSPriceForName fiat estimate the split is the other way round: fiatEstimate.paymentAmount is the base and fiatEstimate.paymentAmountWithAntSpawn is the total.) Throws FiatPaymentsDisabledError when the service has Stripe switched off.