The various reasons a purchase can fail.
See Also: IStoreListener.OnPurchaseFailed.
| PurchasingUnavailable | The system purchasing feature is unavailable. | 
| ExistingPurchasePending | A purchase was already in progress when a new purchase was requested. | 
| ProductUnavailable | The product is not available to purchase on the store. | 
| SignatureInvalid | Signature validation of the purchase's receipt failed. | 
| UserCancelled | The user opted to cancel rather than proceed with the purchase. | 
| PaymentDeclined | There was a problem with the payment. | 
| DuplicateTransaction | A duplicate transaction error when the transaction has already been completed successfully. | 
| Unknown | A catch-all for unrecognized purchase problems. | 
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