Can Anyone Help me About Postback on android?

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http://androidforums.com – Hello im working on a project.I will make a Pay-Per-Install Apk. The app should looks like WHAFF, CashKing or FreeMoneyFactory... The app should store the user data into a mysql database... The user launch the app, make the login or register... he enter to the user dashboard when he can find a TextView with the current point value... the user start click a button and open a offerwall (like everbadge, sponsorpay,w3i... etc), when he complete the offer there's a postback to my website where the php add the amount of the completed offer point to the mysql database and i can find the current to (General)