Sending Apple Push Notification Service (APNS) Notifications from a ThingWorx Service

Does anyone have sample code, or a ThingWorx extension, for sending push notifications to iOS devices via the Apple Push Notification Service (APNS) from a ThingWorx service? The specific problem I'm trying to solve is management of an Apple-provided certificate that must be sent to APNS during the negotiation of a connection:

(Image from Apple's Local and Remote Notification Programming Guide)

I'm looking for best practices on storing/managing the certificate and negotiating the connection with APNS.