I haven't used any of IAPs, but maybe somebody that have used both IOS IAPs and Google Billing can answer this question.
Is it possible to create common wrapper for both IAPs, so one could easily and seamlesly implement IAPs for both platforms (and maybe even others more to come).
How different are API's for both IAPs?
Would something like this be useful? (And for example can be used in GiderosCodingEasy, etc).