How to solve the Enqueued and Thread issues thought the In App Purchase?

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Created Jan ’21

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I looked rest of the code to check to look it was perfect, no missed by the followed the StoreKit tutorials by Apple Inc, and YouTube channel, too. I believed I was very closer to completed IAP! somehow, I noticed I got three codes to show the gray error that shows up after the app has frozen while it appeared sandbox account UIAlertController to purchase the products.

One Code Results:

Error: Enqueued from com.apple.main-thread (Thread 1)

Code Block  func purchase(product: IAPProduct) {
        
        guard let productToPurchase = products.filter({
                                                        
            $0.productIdentifier == product.rawValue
            
        }).first else {
           
            return
            
        }
       let payment = SKPayment(product: productToPurchase)
 
        /* Code Crashed
        paymentQueue.add(payment)
        */
    }

I built UITableView to show an Episode with the Purchase version. The error was the same as the previous code.

Code Block     if indexPath.row == 3 {
                        
         /* code crashed
         IAPService.shared.purchase(product: .epsiode4non_consumable)
         */
    }

Now This is a final code that has shown one word by the error that says; "Thread" without mentioning any what is the issues.

Code Block  extension IAPService: SKPaymentTransactionObserver {
    func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
        for transaction in transactions {
            
            print(transaction.transactionState.status(), transaction.payment.productIdentifier)
            
            switch transaction.transactionState {
            
            case .purchased:
                
               SKPaymentQueue.default().finishTransaction(transaction)
               SKPaymentQueue.default().remove(self)
                print("Successful Purchased!")
                queue.finishTransaction(transaction)
                
            case .failed:
                
                SKPaymentQueue.default().finishTransaction(transaction)
                SKPaymentQueue.default().remove(self)
                print("Purchase is Failed.")
                queue.finishTransaction(transaction)
                
            case .restored:
                
                SKPaymentQueue.default().finishTransaction(transaction)
                SKPaymentQueue.default().remove(self)
                print("Purchase Restore is Successful.")
                queue.finishTransaction(transaction)
                
            case .deferred:
                
                SKPaymentQueue.default().finishTransaction(transaction)
                SKPaymentQueue.default().remove(self)
                print("Purchase is Deferred.")
                queue.finishTransaction(transaction)
                
                
                /* code crashed
               default: queue.finishTransaction(transaction)
                */
            }
        }
     }
  }

I have no idea what is thread stands for? Someone can give me some tips about Thread for IAP issues?

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