"The purchase is not in a valid state to perform the desired operation." Callback

Hello,

We’re confirming receipts using SERVICE.purchases().products().acknowledge() method. But there are countless receipts that return with “The purchase is not in a valid state to perform the desired operation.” when we contacted the Google Support channel, they didn’t help us at all. Is there any chance that we could get a proper explanation regarding this callback?

Edit: For future Google searches; Contacted Google Support team, due to our architecture we sometimes try to acknowledge a receipt more than once. It turns out (for consumable in app purchases) trying to acknowledge a receipt that has already been acknowledged returns with this callback.

[umityayla]

Sorry for not posting a follow up. Contacted Google through issue tracker and their answer was the following way;

This may happen when you’re trying to acknowledge or consume an item that is pending (not this case) or already marked acknowledged or consumed (likely this case).

[umityayla]

Thank you for your help and have a nice day!