Android - Invoking the in-app billing service without setting a target package for the intent

I just received an email from Google Play stating:
“We detected that your app(s) listed at the end of this email are invoking the in-app billing service without setting a target package for the intent. This can enable a malicious package to bypass the Play store billing system and access items that have not been purchased.”

This game is developed using Unity3D. I do not have any native knowledge of native Android. What should I do in Unity3D so that this is fixed? Thank you

For people using Prime31’s In App Billing plugin, they have fixed this error in their latest version (2.11)
From their change log:

**Version 2.11

  • version bump which includes the fix for the Android billing Intent vulnerability**