I believe that the purchaseToken persists, and it only changes its purchase 
state.  It should not be possible to buy twice.  When I have attempted a 
purchase request with the product id of an item already subscribed, it pops 
up with a message that indicates that I already own it and cannot purchase 
again.  Another safeguard to ensure that the situation never arises anyway 
is to update your UI to disable controls that trigger purchase requests.  I 
hope this info helps.

On Wednesday, September 26, 2012 4:15:24 AM UTC-4, Klymentiy Haykov wrote:
>
> Will subscription  purchaseToken be changed after user buys 
> expired/canceled subscription again? Subscription is managed item, but it's 
> possible to buy it twice, so it's behavior is not clear.

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