I recently added an OUYA plugin for Corona PRO users which enables in-app-purchases. You can build and publish from Mac and Windows.
https://devs.ouya.tv/developers/docs/corona
Here you’ll find videos, examples, and documentation.
General Steps
The general steps for in-app-purchases are:
Check player prefs to see if the full game has been unlocked.
If the game hasn’t been unlocked, check receipts for the purchase.
If the purchase is found, set the player prefs that the game is unlocked.
If the purchase is not found, show the store/buy button.
When the buy button is pressed, request a purchase.
Upon successful purchase set the player prefs for full game unlocked.
If the player prefs has full game unlocked, show a visual change that the game is unlocked.