IAP in godot

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:bust_in_silhouette: Asked By THE HELIX

I setup the iap in godot by modules. When i press buy button google tester account opens and i purchase the coin. The coin is added to coin collected. When i again press buy button Google tester account opens and i cancel the purchase but also coin is added even after cancelling. How to set it up such that coin is added only after purchase is success?