Hi Tina,
I'd love to hear your feedback regarding this issue. Did you solve it? 
I too get the onPurchaseStateChange callback only sometimes... for some 
reason, sometimes a user buys a product, I get the payment but the 
onPurchaseStateChange callback is never called.
Only the onRequestPurchaseResponse is always called.

Here's what I did: http://stackoverflow.com/a/12948238/444324

But did you get any feedback whether it's ok to count on 
the onRequestPurchaseResponse callback?

Thank you!

On Thursday, July 19, 2012 6:28:13 PM UTC+3, Tina wrote:
>
> Hi, all.
> I have implemented InAppBilling in my application and after publication I 
> have found that sometimes my application did not received 
> PURCHASE_STATE_CHANGED message and onPurchaseStateChange is never called.
> On the other hand it always received REQUEST_PURCHASE message with correct 
> information about purchace state (if user card is invalid)
> The question is: could I use REQUEST_PURCHASE message as final information 
> about purchace transaction and perform all operation in 
> onRequestPurchaseResponse callback?
> If it is incorrect please tell me - what is the best way to act in such 
> situation?
>
> Thank you in advance,
> Tina
>
>

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