Google on Thursday announced that in-app billing, which was announced back in January, would be available at the Android Market next week.

Apps included in the in-app billing are now available to developers for testing. Developers can upload and test apps but they can not publish them until Google launch the service next week.

The company said the payment procedure during the testing phase would be precisely the same as it would be for the actual consumers during live transactions. Earlier at January’s Inside Mobile conference in San Fransisco, Eric Chu from the Android developer ecosystem had expressed his disapproval for Android Market’s lack of in-app purchases.

At the event, Eric promised that the company would pump more money into merchandizing, payments, downloading and all that.

Apple’s App Store and BlackBerry App World have been offering in-app billing service since October 2009 and September 2010, respectively.