What are the rules for iTunes about apps using third party payment processors? For instance, givng users the option to use PayPal or another merchant account for purchases. I know apps like Jott & Netflix use their own payment processor. I want like to confirm that Apple has no issue with using a 3rd party payment vendor. Also curious if I would be able to use both App Store in app purchasing and a 3rd payment processor. I don't know of any apps that have both options. Thanks!