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Play Billing 2.0 added the ability to purchase in-app items from outside of the application.

This ACK confirms that the application properly processed the notification and delivered the item to the user. Otherwise, Play assumes that the purchase was lost in the ether sometime before fulfillment (e.g. bug, the app crashed, etc.).

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I assume that part of it is a psychologically-motivated desire to maintain a tight reward loop for Play purchasers, with no payment-processing delays.

How do you get that out of previous comments

Otherwise the item could only be available once purchase was confirmed.

How could it be available if the application didn't ACK that it received the purchase order and granted the item?

From the post, it sounds like the users receive the purchased item immediately but the app developer needs to confirm that the charge went through properly. Otherwise the funds are returned but the user keeps the purchased item.

Without acknowledging the purchase the money was refunded back to the people who purchased it. And the best thing was the dark theme would be activated even if the user got the money refunded.

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