I was reading the whole process flow (by @Eduardo) on this thread Google Analytics iOS Campaign Tracking and URL Builder
If I understood correctly:
a) we can only track iOS installations (+ source / medium etc. ) in GA, and no installation / conversion data is reported in AdWords (Display only) iOS app install campaign.
b) because, GA doesn't support Postbank URLs > AdWords / AdMob (only to other ad networks InMobi / MillenialMedia / Tabjoy etc. - wonder why?! despite both products belong to Google)
Thanks in advance for your clarification on this!
/Vibhor
