การแปลงสกุลเงินสำหรับ Shopify

export async function convertForDisplay(amount: number, from: string, to: string) {
  const response = await fetch(
    `https://api.exchangerate.dev/v1/convert/${from}/${to}/${amount}`,
    {
      headers: { Authorization: `Bearer ${process.env.EXCHANGERATE_API_KEY}` },
      signal: AbortSignal.timeout(5000),
      next: { revalidate: 60 },
    },
  );
  if (!response.ok) throw new Error(`FX API returned ${response.status}`);
  const data = await response.json();
  return { amount: data.converted, currency: to, observedAt: data.data_updated_at };
}