Even though the QML Store client is now the 'norm' and formally released, the betas continue, with v3.22.044 now supporting in-app purchases, i.e. applications can call the Store client when needed for handling payments. A few screens and links below. Of note is that this client is now built on the very latest Qt 4.7.4 and Qt quick components v1.1, both of which are baked into the upcoming Belle OS update.

More info on the changes, and download links, here:

• includes fixes for bugs found since the previous one
• is now based on Qt 4.7.4 and Qt quick components 1.1
• offers the next generation of in-app purchase, based on QML.  This feature is available through applications that support in-app purchase

It's not clear at this point which applications might support in-app purchases - but at least this Store client will let the appropriate developers try the functionality out.

Screenshot gallery of the installation. Comments welcome if you find an app that's available which supports the new purchasing system!