// Send payment data to DataFast's API
const handler = async (req, res) => {
  const datafast_visitor_id = req.cookies.datafast_visitor_id;

  try {
    const response = await fetch("https://datafa.st/api/v1/payments", {
      method: "POST",
      headers: {
        Authorization: `Bearer ${DATAFAST_API_KEY}`,
        "Content-Type": "application/json",
      },
      body: JSON.stringify({
        amount: 29.99,
        currency: "USD",
        transaction_id: "payment_456",
        datafast_visitor_id: datafast_visitor_id,
      }),
    });

    res.status(200).send("Payment tracked");
  } catch (error) {
    console.error("Error tracking payment:", error);
    res.status(500).send("Failed to track payment");
  }
};