If you want to collect fees after the free trial expires, you must collect all fees for the full version of the Product through the Payment Processor on the Market... All fees received by Developers for Products distributed via the Market must be processed by the Market's Payment Processor.

Looks like Apple isn't the only one wanting to make sure that app payments are being run through appropriate channels . The Visual VoiceMail app, which has been downloaded about a million times (literally), has just been pulled from the Android Market . When developers at PhoneFusion asked the reasonable question, "why," they were simply directed to section 3.3 of the Android Market Developer Distribution Agreement:The service allows users to purchase premium features through the company's website, something that many other apps do and that is certainly not new to Visual VoiceMail. What's next remains to be seen, but sadly Google is saying PhoneFusion must re-submit the app with a new name -- losing all the positive reviews it's racked up. Hardly an ideal solution.