If you application uses the Magium Configuration Manager you can use this module to retrieve a configured Pusher instance, both on the frontend and the backend.
composer require magium/mcm-pusher-factory
Follow the instructions at the Magium Configuration Manager GitHub link to get configured, or run the bin/magium-configuration CLI.
$factory = new \Magium\Configuration\MagiumConfigurationFactory();
$config = $factory->getManager()->getConfiguration();
$pusher = Magium\ConfigurationManager\Pusher\PusherFactory::staticFactory($config);
// or
$factory = new Magium\ConfigurationManager\Pusher\PusherFactory($config);
$pusher = $factory->factory();
or configure your dependency manager to make Magium\ConfigurationManager\Pusher\PusherFactory the factory for the Pusher instance.
If you want to use the frontend integration you can use the generic view handler provided here.
<?php
$factory = new \Magium\Configuration\MagiumConfigurationFactory();
$config = $factory->getManager()->getConfiguration();
$helper = new Magium\ConfigurationManager\Pusher($config);
?>
<html>
<head>
<script type="text/javascript">
var pusher = <?php echo $helper->getConnectionJavaScript(); ?>
</script>
</head>
</html>