1. Create a certificate directory in your application/ folder
2. Copy your pem file (which includes) its private key in application/certificate
3. Copy modules/apn/config/apn.php into application/config/apn.php and edit it

$apn = APN::factory('name of the application');

public function send($deviceToken, $body, $identifier = null, $expiry = null)

Simple usage: $apn->send("device token here", "alert text"); or $apn->send(array("device1", "device2"), "alert text");

Advanced usage: $body = array( 'aps' => array( 'alert' => 'APN test', 'sound' => 'default' ) );

$apn->send("device token here", $body); or $apn->send(array("device1", "device2"), "alert text");