what is the differences of purchase in app and create your own link to pro version?
<p>I want to create two version apps: lite and pro.
I look through purchase in app guide , but it is not allowed to change the lite version code to add functionality. you can just pop up an store UI to link the user to pro version, right?
But in this way, we can do it ourself, we copy the link of pro version in the appstore ,then pop up a dialog guide the user to app store?</p>

<p>I know that purchase in app can download new resource to the app,I may miss something about adding new function to the app?</p>

<p>thanks for your guys!</p>
