Setting up crypto payments via Bitpay

Question

I want to set up nodejs bitpay crypto payments. I am trying to test the setup for now.

I have used the bitpay button for it but it doesn't send back the request to the backend at IPN it asks, as my route is: http://localhost:4000/cryptopay Bitpay Sevice IPN and Browser Redirect

The browser redirect is working but the service IPN is not getting any response from the bitpay. I tried doing console.log at the request.

Backend request handler.

app.post("/cryptopay", async(req, res) => {
  console.log("Crypto Pay: ")
  console.log(req);
});

Even after many successful payments, I don't have any response here.