android - In-app Purchase in ANDGINE -

have small game in andengine in have 3 slides

title activity_one activity_two 

now want make activity 1 , activity 2 purchase able. in short words implement in app in andengine project famous in app-3 google used or there other methods enable in-app purchase in andengine. searched on net did not find relevant sol or info. appricited

google's in-app works (i've used it). else's, amazon, etc. in app api's not tie game implementation. use think best return target audience.

just prepared, in-app bit of work.