Paypal checkout doesn't send PAYMENT.SALE.COMPLETED on purchase to my webhook

I'm trying to create a webhook to listen for paypal checkout purchases.

When user purchases some item paypal is supposed to send data to my server (all I need is an email)

I had created a nodejs webhook POST request using express.js and it does receive data only from webhook simulator multiple times, even when I only clicked it once (https://developer.paypal.com/dashboard/webhooksSimulator)

Here's my source code:

app.post('/paypal-webhook', (req, res) => {    console.log('Webhook event received')    const rawBody = JSON.stringify(req.body);    console.log(rawBody)    const signature = req.headers['paypal-transmission-sig'];    console.log(req.body)    const verified = crypto.createHmac('sha256', paypalWebhookSecret)        .update(rawBody)        .digest('hex');    if (signature === verified) {        const event = req.body;        // Check if the event is a payment sale completed event        if (event.event_type === 'PAYMENT.SALE.COMPLETED') {            console.log('Payment sale completed:', event);            // Your course fulfillment logic here        }        res.status(200).send('Webhook received successfully.');    } else {        console.error('Webhook verification failed.');        res.status(403).send('Unauthorized');    }});

The issue I'm having is that on paypal checkout when user buys something it doesn't send anything to my webhook. It only sends data from webhooks simulator.