How do I pull some data from store kit

Code Block 
import StoreKit
import Foundation
final class IAPManager: NSObject, SKProductsRequestDelegate, SKPaymentTransactionObserver {
    static let shared = IAPManager()
    private var products = [SKProduct]()
    private var productBeingPurchased: SKProduct?
    enum Product: String, CaseIterable {
        case removeAds = "JokesRUs.RemoveAds"
    }
    public func fetchProducts() {
        let request = SKProductsRequest(productIdentifiers: Set(Product.allCases.compactMap(({ $0.rawValue }))))
        request.delegate = self
        request.start()
    }
    func productsRequest(_ request: SKProductsRequest, didReceive response: SKProductsResponse) {
        products = response.products
    }
    func request(_ request: SKRequest, didFailWithError error: Error) {
        guard request is SKProductsRequest else {
            return
        }
        print("Product fetch request failed")
    }
    public func purchase(product: Product) {
        guard SKPaymentQueue.canMakePayments() else {
            return
        }
        guard let storeKitProduct = products.first(where: { $0.productIdentifier == product.rawValue }) else {
            return
        }
        
        let paymentRequest = SKPayment(product: storeKitProduct)
        SKPaymentQueue.default().add(self)
        SKPaymentQueue.default().add(paymentRequest)
        
    }
    func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
        transactions.forEach({ transaction in
            switch transaction.transactionState {
            case .purchasing:
                //No op
                break
            case .purchased:
                handlePurchase(transaction.payment.productIdentifier)
                break
            case .failed:
                break
            case .restored:
                break
            case .deferred:
                break
            @unknown default:
                break
            }
        })
}
    private func handlePurchase(_ id: String) {
        UserDefaults.standard.setValue(true, forKey: id)
        print(id)
    }
}

Code Block 
IAPManager.shared.purchase(product: .removeAds)