func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
        print("Received Payment Transaction Response from Apple")

        for transaction:AnyObject in transactions {
            if let trans:SKPaymentTransaction = transaction as? SKPaymentTransaction {
                switch trans.transactionState {
                case .purchased:
                    print("Product Purchased")
                    SKPaymentQueue.default().finishTransaction(transaction as! SKPaymentTransaction)
                    // Handle the purchase
                    UserDefaults.standard.set(true , forKey: "purchased")
                    // Get the receipt if it's available
                    if let appStoreReceiptURL = Bundle.main.appStoreReceiptURL,
                        FileManager.default.fileExists(atPath: appStoreReceiptURL.path) {

                        do {
                            let receiptData = try Data(contentsOf: appStoreReceiptURL, options: .alwaysMapped)
                            print(receiptData)

                            let receiptString = receiptData.base64EncodedString(options: [])

                            // Read receiptData
                            // Encode data as JSON
                            let jsonData = try? JSONSerialization.data(withJSONObject: receiptString)

                            // Create POST request
                            let url = URL(string: "http://fe01.kilosierracharlie.me/verifypayment")!
                            var request = URLRequest(url: url)
                            request.httpMethod = "POST"
                            request.setValue("application/json", forHTTPHeaderField: "Content-Type")
                            request.httpBody = jsonData

                            // Send the data
                            URLSession.shared.dataTask(with: request) { data, response, error in
                                guard let data = data, error == nil else {
                                    print(error?.localizedDescription ?? "No data")
                                    print("No data could be sent to the server. Please contact us.")
                                    return
                                }
                                let responseJSON = try? JSONSerialization.jsonObject(with: data, options: [])
                                if let responseJSON = responseJSON as? [String: Any] {
                                    print(responseJSON)
                                }
                            }
                        }
                        catch {
                            print("Couldn't read receipt data with error: " + error.localizedDescription)
                        }
                    }
                    break;

                case .failed:
                    print("Purchased Failed")
                    SKPaymentQueue.default().finishTransaction(transaction as! SKPaymentTransaction)
                    break;

                case .restored:
                    print("Already Purchased")
                    SKPaymentQueue.default().restoreCompletedTransactions()

                    // Handle the purchase
                    UserDefaults.standard.set(true , forKey: "purchased")
                    //adView.hidden = true
                    break;
                default:
                    break;
                }
            }