How do certain iPhone apps allow purchases without IAP?
<p>According to section 11.2 of the App Store Review Guidelines,</p>

<pre><code>Apps utilizing a system other than the In App Purchase API (IAP) 
to purchase content, functionality, or services in an app will be rejected.
</code></pre>

<p>Various apps like JetSetter, Gilt, and Kayak include in-app purchasing flows that either collect credit card information directly, or use a UIWebView to direct the user to a third-party website to purchase goods and services.</p>

<p>What provision allows apps to do this, and what are the limitations to purchasing physical goods and services in an iPhone app without using IAP?</p>
