Whilst one-time purchases have been available for a while now, this only meant to could sell something along the lines of a 'lifetime subscription'.
With the release of Addons this means you can now sell products that can be repeatedly purchased. This kind of setup lends itself well to apps selling credit-based subscriptions. So having a monthly subscription that gives you X number of credits - now you can allow your customers to purchase top-ups along side their subscription.
Addons has also been designed to be stand alone too, only want to sell top-ups without the subscription - no problem Kanuu can handle this too!
You can start using Addons today by heading over to your Kanuu products dashboard and enabling some addons!