Webhook Best Practices

// Good: acknowledge immediately, process later
app.post("/webhook", (req, res) => {
  res.status(200).send("OK"); // Respond immediately

  // Process asynchronously
  processWebhookAsync(req.body);
});

const processedEvents = new Set(); // Use a database in production

app.post("/webhook", (req, res) => {
  const event = req.body;

  if (processedEvents.has(event.id)) {
    return res.status(200).send("Already processed");
  }

  processedEvents.add(event.id);
  // Process the event...

  res.status(200).send("OK");
});