StoreKitWtfAppleExtensions.m

#pragma mark - wtf apple section

// instead of relying on SKPaymentTransactionState, use isTransactionRestore and isTransactionPurchase

- (BOOL)isTransactionRestore:(SKPaymentTransaction *)transaction {
    BOOL purchasedButStillRestore = [self isPurchaseButStillRestoreTransaction:transaction];
    return (transaction.transactionState == SKPaymentTransactionStateRestored) || purchasedButStillRestore;
}

- (BOOL)isTransactionPurchase:(SKPaymentTransaction *)transaction {
    BOOL purchasedButStillRestore = [self isPurchaseButStillRestoreTransaction:transaction];
    return (transaction.transactionState == SKPaymentTransactionStatePurchased && !purchasedButStillRestore);
}

- (BOOL)isPurchaseButStillRestoreTransaction:(SKPaymentTransaction *)transaction {
    return (transaction.transactionState == SKPaymentTransactionStatePurchased) &&
           (transaction.originalTransaction != nil) &&
           ![transaction.transactionIdentifier isEqualToString:transaction.originalTransaction.transactionIdentifier];
}