Localize Stripe Prices to the Visitor's Currency in 25 Lines

Stripe is opinionated: a Price object has one currency. If your product is priced at $79 USD, that's what Stripe charges. But for conversion optimization, you want to display the price in the visitor's local currency — Argentinians see ARS, Brazilians see BRL, Germans see EUR — converted at the live FX rate. The math is simple. The trick is doing it without a 200ms client-side flash. The architecture Stripe holds the canonical price (USD) — never change this. At request time, detect visitor coun