Prosites track unsubscribes

https://premium.wpmudev.org/forums/topic/how-does-a-prosite-unsubscribe#post-245251

Hi, currently there is no efficient way for a site that uses Stripe to track unsubscribes. It will be helpful if the pro site subscriber and the site admin can receive both a confirmation email when the pro site subscriber unsubscribes. This way there is a more tangible record for disputes. It also helps with follow up promotional email to bring the customers back on board, shutting off any manually added services, spot audit checks such as double checking that the customer's credit card is not accidentally rebilled in the future so that charge back fees are not incurred, reducing confirmation of unsubscribe email requests, etc.