>
> > the Google Play services seems half implemented to me :-( 
>
> AFAIK, it is not available yet, are you referring to the docs? 
>
> https://developers.google.com/android/google-play-services/ 
>

No. Perhaps I misunderstood one of the GoogleIO sessions. They were 
referring to in-app billing and Google Play Services in the same breath. It 
appeared to be a rebranding of billing as Google Play Services. I was 
actually referring to in-app billing. The example is all locally hosted, 
but the doco in the example keeps reminding you that sections of this 
should be hosted on your own server (eg signature verification and 
management of unmanaged items), but as soon as you try the 2nd of those you 
run into this exact question of user identity. SO it kind of looks half 
baked to me. I was expecting the purchased event to contain some kind of 
user identity as well as transaction identity.
 

> > 
> > re: OAuth2 on Android - isn't that already available? 
> > http://code.google.com/p/google-api-java-client/wiki/OAuth2#Android 
> > 
>
> Yes, but only sort of. Now it depends on the Google services framework 
> which is part of the firmware and has different versions on different 
> devices. 
> Additionally, not all OAuth2 scopes are supported, and the permission 
> screen can be cryptic ("Do you want to allow access to app X to data of 
> scope 'https://blah.foo.bar/somedata'", or some such). Google Pay 
> Services 
> will be part of Google Play and updated automatically, so most devices 
> should get the same implementation. It it said to have a better account 
> chooser and other UI/usability improvements. Not sure why they are 
> delaying though, it was announced a while back as 'coming soon'. 
>

Hmm .. 
I also couldn't see from the details that using Google Play Services 
requires any extra permissions. 
It doesn't seem to have an account chooser, but that doesn't mean that the 
user will choose the same account with which they made the purchase. And it 
would seem weird anyway, since they just selected their account when making 
a purchase and now I'll have to ask them to select their account again?

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