Retrieves a list of file names for the .p12 certificates on the Unwired Server.
java.util.List SUPServerConfiguration.getApplePushNotificationCertificateNames()
If successful, returns an object of the specified type (can be null). If unsuccessful, returns SUPAdminException.
// List APNS certificate names List<String> list = supServerConf.getApplePushNotificationCertificateNames();