Quite some time ago Microsoft announced that a developer will be able to sell IAPs (In-App Purchases) as a auto renewable subscription i.e. a user is billed once a period un
See Bernardo's recent BUILD2017 session: https://channel9.msdn.com/events/Build/2017/B8098
Subscriptions is in preview now, and available to all developers later this summer.
It appears that the subscription feature finally moved from the mysterious "Early Adoption Program" to the publicly available "Dev Center Insider Program" and that makes a huge difference for many of us. Simply put any developer can apply, join the program and start supplying the auto recurring subscriptions this very hour. Yay.
Dev Center Insider Program feature: Subscription add-ons: Sell digital products in your app (such as app features or digital content) as add-ons, with automated recurring billing periods.
How Dev Center Insiders can try it: Choose Subscription for your add-on's product type and specify a subscription period. You must also use APIs in the Windows.Services.Store namespace to enable the subscription experience.
Date added: December 2017
The docs seem to be intact: Enable subscription add-ons for your app