Why does App keeps crashing when I tap paid (IAP) because 'Index out of range' come with Memory and servers, too? (Swift)

Question

I am not sure if someone in this StackOverflow has skills with Apple's Code to create IAP without an installed Cocoapod. (BTW: I am not fans of Cocoapod) I am here to show you what I find code that I has trouble with this situation for many hours.

First start here

import UIKit
import StoreKit

let nc = NotificationCenter.default

struct dataStoreMemory {
    static var fromLocal: [Int] = UserDefaults.standard.object(forKey: "Already Purchased") as? [Int] ?? [0]
}

var models = [SKProduct]()

var askedForEpisode: Int? = nil

enum Product: String, CaseIterable {
    case Episode2 = "com.CoreJezlleland.Episode2"
    case Episode3 = "com.CoreJezlleland.Episode3"
    case Episode4 = "com.CoreJezlleland.Episode4"
    case Episode5 = "com.CoreJezlleland.Episode5"
    case Episode6 = "com.CoreJezlleland.Episode6"
    case Episode7 = "com.CoreJezlleland.Episode7"
    case Episode8 = "com.CoreJezlleland.Episode8"
    case Episode9 = "com.CoreJezlleland.Episodes9"
    case Episode10 = "com.CoreJezlleland.Episode10"
}

extension EpisodesViewController {
    func fetchingProducts() {
        let request = SKProductsRequest(productIdentifiers: Set(Product.allCases.compactMap({ $0.rawValue })))
        request.delegate = self
        request.start()
    }
    

This is only one What caused crashed and console keep tell me 'Index out of range' and 'Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArray0 objectAtIndex:]: index 3 beyond bounds for empty NSArray'

    func makePayment() {
        if SKPaymentQueue.canMakePayments() {
            print("before")
            let payment = SKPayment(product: models[(askedForEpisode ?? 0)])
            // MARK: Crashed
            // askedForEpisode has crashed because 'Index out of range'
            print("Crash")
            fetchingProducts()
            SKPaymentQueue.default().add(payment)
        } else {
            print("User unable to make payment")
        }
    }
    

(keep add code below)

    func productsRequest(_ request: SKProductsRequest, didReceive response: SKProductsResponse) {
        DispatchQueue.main.async {
            models = response.products
        }
    }
    
    func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
        transactions.forEach({
            switch $0.transactionState {
            case .purchasing:
                print("Payment in processing")
            case .purchased:
                print("Payment Purchased")
                SKPaymentQueue.default().finishTransaction($0)
                thankYouPayment()
                
                dataStoreMemory.fromLocal.append(askedForEpisode!)
                UserDefaults.standard.set(dataStoreMemory.fromLocal, forKey: "Already Purchased")
            case .failed:
                print("Payment Fail")
                SKPaymentQueue.default().finishTransaction($0)
            case .restored:
                print("Payment Restored")
                self.dismiss(animated: true)
                thankYouPayment()
            case .deferred:
                print("Payment Deferred")
            @unknown default:
                print("Unknown Payment")
            }
        })
    }
    
    @objc func restoreTapped() {
        present(restoreWait, animated: true, completion: {
            SKPaymentQueue.default().restoreCompletedTransactions()
        })
    }
    
    func thankYouPayment() {
        restoreWait.dismiss(animated: true)
        let ac = UIAlertController(title: "Thank You", message: nil, preferredStyle: .alert)
        ac.addAction(UIAlertAction(title: "Alright!", style: .default))
        present(ac, animated: true)
        
        nc.post(name: NSNotification.Name("Reload List"), object: nil)
    }
    
    func paymentQueueRestoreCompletedTransactionsFinished(_ queue: SKPaymentQueue) {
        restoreWait.dismiss(animated: true)
        if queue.transactions.count == 0 {
            let ac = UIAlertController(title: "Restore Error", message: "You do not have any restore purchases in your account.", preferredStyle: .alert)
            ac.addAction(UIAlertAction(title: "OK", style: .default))
            present(ac, animated: true)
        } else {
            dataStoreMemory.fromLocal.removeAll()
            for x in queue.transactions {
                for num in 1...10 {
                    if x.transactionIdentifier == "com.CoreJezlleland.Episode\(num)" {
                        dataStoreMemory.fromLocal.append(num)
                    }
                }
            }
            thankYouPayment()
        }
    }
    
    func paymentQueue(_ queue: SKPaymentQueue, restoreCompletedTransactionsFailedWithError error: Error) {
        restoreWait.dismiss(animated: true)
        let ac = UIAlertController(title: "Restore Error", message: "There was a problem while restoring your purchased. We recommend you try again.", preferredStyle: .alert)
        ac.addAction(UIAlertAction(title: "OK", style: .default))
        present(ac, animated: true)
    }
    
    func errorPayment() {
        restoreWait.dismiss(animated: true)
        let ac = UIAlertController(title: "Error Payment", message: "The payment was declined or something went wrong, so please try again.", preferredStyle: .alert)
        ac.addAction(UIAlertAction(title: "OK", style: .default))
        present(ac, animated: true)
    }
}

End of Code

Now I created this tableView.deselectRow in extension EpisodesViewController: UITableViewDataSource, UITableViewDelegate {}

 func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        tableView.deselectRow(at: indexPath, animated: true)
        
        switch detectBypassTime() {
        case .NoInternet:
            
            // (Alert popup) Do something if there is no internet
            
            print("Sorry, no internet.")
            
            let imageView = UIImageView()
            imageView.image = UIImage(named: "No Wifi")
            
                // no wifi : wifi.slash
                // wrong clock: Incorrect Clock
            imageView.translatesAutoresizingMaskIntoConstraints = false

            // Create the alert controller
            let alertController = UIAlertController(title: "\n\n\(noWifiTtitle)", message: noWifiMessage, preferredStyle: .alert)
            
            
            
            let cancelAction = UIAlertAction(title: cancelText, style: UIAlertAction.Style.cancel) {
                  UIAlertAction in
                   print("Cancel Pressed")
              }
            
         
            
              // Add the actions
              alertController.addAction(cancelAction)
              alertController.view.addSubview(imageView)
            
            imageView.topAnchor.constraint(equalTo: alertController.view.topAnchor, constant: 10).isActive = true
            imageView.centerXAnchor.constraint(equalTo: alertController.view.centerXAnchor).isActive = true
            imageView.widthAnchor.constraint(equalToConstant: 40).isActive = true
            imageView.heightAnchor.constraint(equalToConstant: 40).isActive = true
            
              // Present the controller
            self.present(alertController, animated: true, completion: nil)
            
        case .BadTime:

            // (Alert popup) Do something is iPhone or iPad time / date is incorrect.
            
            print("Sorry, your device is incorrect time / date. Please fix it.")
            
            let imageView = UIImageView()
            imageView.image = UIImage(named: "Incorrect Clock")
            
                // no wifi : wifi.slash
                // wrong clock: Incorrect Clock
            imageView.translatesAutoresizingMaskIntoConstraints = false

            // Create the alert controller
            let alertController = UIAlertController(title: "\n\n\(clockBlockTtile)", message: clockBlockMessage, preferredStyle: .alert)
            
            
            
            let cancelAction = UIAlertAction(title: cancelText, style: UIAlertAction.Style.cancel) {
                  UIAlertAction in
                   print("Cancel Pressed")
              }
            
         
            
              // Add the actions
              alertController.addAction(cancelAction)
              alertController.view.addSubview(imageView)
            
            imageView.topAnchor.constraint(equalTo: alertController.view.topAnchor, constant: 10).isActive = true
            imageView.centerXAnchor.constraint(equalTo: alertController.view.centerXAnchor).isActive = true
            imageView.widthAnchor.constraint(equalToConstant: 40).isActive = true
            imageView.heightAnchor.constraint(equalToConstant: 40).isActive = true
            
              // Present the controller
            self.present(alertController, animated: true, completion: nil)
            
            
            
            
        case .Passed:
            // Move all didselect into here.
            print("Go ahead, enjoy the story!")
            
        }
        
        if dataStoreMemory.fromLocal.contains(indexPath.row) {
            accessStory(row: indexPath)
        } else {
            askedForEpisode = indexPath.row
            makePayment()
        }
    }

I forgot to mention that 'switch detectBypassTime() {}' shows up from above to create from these codes in First View Controller to check if WiFi or Data is on to work Apple Pay in 'EpisodeViewController'

extension WelcomeViewController {
    @objc func startTimeDetect() {
        let checkTimeBypass = detectBypassTime()
        switch checkTimeBypass {
        case .NoInternet:
            // Do something if there is no internet
            print("Sorry, no internet.")
        case .BadTime:
            // Do something is iPhone or iPad time / date is incorrect.
            print("Sorry, your device is incorrect time / date. Please fix it.")
        case .Passed:
            // Do something if time / date is normal.
            print("Go ahead, enjoy the story!")
        }
    }
}

enum BypassTimeMode {
    case NoInternet
    case BadTime
    case Passed
}

func detectBypassTime() -> BypassTimeMode {
    let dateformatter = DateFormatter()
    dateformatter.dateFormat = "yyyy-MM-dd hh:mm"
    if timeServer() != nil {
        
        let localTime = dateformatter.string(from: Date())
        let serverTime = dateformatter.string(from: timeServer()!) // Few mins later it will cause itself app crashed.
     
        if localTime == serverTime {
            return .Passed
        } else {
            return .BadTime
        }
    } else {
        return .NoInternet
    }
}

func timeServer() -> Date? {
    let url = URL(string: "http://worldtimeapi.org/api/ip")!
    do {
        var getTimeSince1970: Int!
        let jsonData = try Data(contentsOf: url, options: .alwaysMapped)
        let jsonDecoder = JSONDecoder()
        let jsonCatalogs = try? jsonDecoder.decode(JSONTime.self,from: jsonData)
        getTimeSince1970 = Int("\(jsonCatalogs!.unixtime)")
        let getDate = Date(timeIntervalSince1970: TimeInterval(getTimeSince1970!))
        return getDate
    } catch {
        return nil
        }}
    struct JSONTime: Decodable {
        let unixtime: Int
    }

Well, in that cases I used the codes for IAP and Memory that were created by Apple, Kinda hard to understand why it was hard to find a way to fix those issues with NSArray in making sure payment() stop crashing and pop alert for pay. Does someone know how to fix it?

I am trying to understand Apple's IAP codes that you may have recommended and not recommend to make solved with IAP issues. Thank you.