example.js

const { stripe_secret_key, stripe_webhook_secret } = privateConfig;

const stripe = new Stripe(stripe_secret_key);
let event: events.IEvent | undefined;

try {
  const sig = req.headers['stripe-signature'] as string;
  const reqBody = req.rawBody.toString();
  event = stripe.webhooks.constructEvent(reqBody, sig, stripe_webhook_secret);
} catch (err) {
  res.status(400).send(`Webhook Error: ${err.message}`);
  return;
}