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 };}