How can I pass parameters when calling a Node.js script from PHP exec()?

I'm trying to implement iOS push notifications. My PHP version stopped working and I haven't been able to get it working again. However, I have a node.js script that works perfectly, using Apple's new Auth Key. I am able to call that from PHP using:

chdir("../apns");
exec("node app.js &", $output);

However, I would like to be able to pass the deviceToken and message to it. Is there any way to pass parameters to the script?

Here's the script I'm trying to run (app.js):

var apn = require('apn');

var apnProvider = new apn.Provider({  
     token: {
        key: 'apns.p8', // Path to the key p8 file
        keyId: '<my key id>', // The Key ID of the p8 file (available at https://developer.apple.com/account/ios/certificate/key)
        teamId: '<my team id>', // The Team ID of your Apple Developer Account (available at https://developer.apple.com/account/#/membership/)
    },
    production: false // Set to true if sending a notification to a production iOS app
});

var deviceToken = '<my device token>';
var notification = new apn.Notification();
notification.topic = '<my app>';
notification.expiry = Math.floor(Date.now() / 1000) + 3600;
notification.badge = 3;
notification.sound = 'ping.aiff';
notification.alert = 'This is a test notification \u270C';
notification.payload = {id: 123};

apnProvider.send(notification, deviceToken).then(function(result) {  
    console.log(result);
    process.exit(0)
});

via Lastmboy