I\'m pretty sure that i\'m using Inapp-billing v3 in my app (\"IInAppBillingService.aidl\" is v3 as far as i know - \"IMarketBillingService.aidl\" would be v2 according to the g
I got the same email as well and am confused by it.
I also use IInAppBillingService.aidl and within IABHelper there's a method launchPurchaseFlow which calls getBuyIntent with the first parameter being version, which is set to 3 so I'm pretty certain I'm using v3.
The IABHelper I'm using is littered with v3 checks and comments.
Suggest you check the same piece of code to make sure and put it down to a Google error otherwise.