Have anyone tried to implement In-App purchase?
When I make a live in-app purchase via Google Play on my app, 90% of the time I get "Your purchase was canceled". But when I look at Google Checkout on my developer account I can find the purchase like it would appear when the purchase was successful.

When I use the test item "android.test.purchased" it never fails.

I have used this code to implement In-App purchase:
http://blog.blundell-apps.com/simple-inapp-billing-payment/

Have anyone had similar problems?
The code is written for the old "Market", is there any changes for "Google Play" In-app?

There is a also another resource called The SOOMLA Project - http://project.soom.la. It's an open source library for in app billing that can be used either as a reference or as a library/sdk.