Return the delivery price for a postcode

Node.js example

async function getDeliveryPrice(postcode) {
  const res = await fetch('https://api.deliveryzone.fi/v1/check', {
    method: 'POST',
    headers: { 'X-Api-Key': process.env.DZ_KEY, 'Content-Type': 'application/json' },
    body: JSON.stringify({ destinationPostcode: postcode }),
  });
  const data = await res.json();
  if (!data.canDeliver) return null;
  return data.priceCents; // e.g. 590 (€5.90)
}

// Display to customer
const price = await getDeliveryPrice('00100');
if (price !== null) {
  showDeliveryFee(price / 100); // convert cents to euros
}