print-2.js

    var secret    = '3d'
    var data      = _json.stringify(webhookBody);
    var signature = crypto.createHmac('sha256', secret).update(data).digest('base64');

    // Check the webhook signature
    if (webhookSignature !== signature) {
        console.log('Access denied - invalid signature');

        return res.send('access denied', 'invalid signature', null, 403);
    }

    console.log(webhookBody);
    console.log('Webhook received successfully!');