"grant access to existing subscribers through a coupon-based system"

Doing some searching I also found another article stating "And One Pass offers payments in mobile apps (i.e. in Android apps), in instances where the mobile OS terms permit transactions to take place outside of the app market " (http://tcrn.ch/ejyk9Y)

If your creating an application on Android and you are going to be charging for it, I think this would allow you to reward your early adopters by giving out coupons and allow them to get the app for free/discount.