Apple states in its App Store Review Guidelines “Apps using IAP to purchase physical goods or goods and services used outside of the application will be rejected”. So is it then legal to implement other payment services than Apple’s In-App-Purchase to buy physical goods? I could imagine services like PayPal, Amazon or Google Checkout but don’t have any experience with those and if they are usable within iPhone Apps.
Apple states in its App Store Review Guidelines Apps using IAP to purchase physical
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You can indeed use outside services.
PayPal’s Express Checkout for Mobile Devices definitely works this way.
That I’ve been able to determine, neither of Amazon’s mobile payment systems allows for true in-app integration; instead you’d have to use a UIWebView and have the user checkout through the web while inside your app.