Social game developers are encouraged visit the Windows Dev Center to learn more about Windows 8.

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The company points to a recent Dev Center document emphasizing Windows 8's optional app receipt system, which can require any transaction be validated on the developer's server.

ENGADGET: Microsoft pins Windows Store app purchase exploits on insecure code

The counterbalance in this story is confirmation in the Dev Center that any in-app commerce will be limited to Windows Phone 8 -- even devices running Windows Phone 7.8 will have to turn to all-or-nothing transactions to directly generate cash.

ENGADGET: Microsoft opens Windows Phone Dev Center, limits in-app purchases to Windows Phone 8 (update: store rebrand too)

Microsoft has shelved its old App Hub in favor of the heavily reworked Windows Phone Dev Center: along with being simpler and more reliable, it now lets app designers offer their apps in four times as many countries (three times as many for paid apps), gives them better tracking tools and lets them at last get payment from Microsoft through PayPal.

ENGADGET: Microsoft opens Windows Phone Dev Center, limits in-app purchases to Windows Phone 8 (update: store rebrand too)