If yes, could anyone send a link please? A tutorial is better 
Ya, there is one. I’m currently using Unibill which allow IAP for almost all platforms. Check it out. Unibill | Services | Unity Asset Store
–TwisterK
It is doable, but you’ll probably have to spend a day or two learning about how to do it right. If you’re comfortable writing code in Eclipse for Android, it shouldn’t be too difficult.
I learned most of the code from here: http://developer.android.com/training/in-app-billing/index.html