Redeem Button for in app purchases - ios

Question

I submitted my app to apple but they rejected it because, there was no redeem button for in app purchases. How can i do that. I made a redeem button and linked it up to the view controller. Where do i go from there?
Here is my code:
class StoreViewController: UIViewController, SKPaymentTransactionObserver, SKProductsRequestDelegate {
#IBOutlet var redeemOutlet: UIButton!
#IBAction func redeem(_ sender: Any) {
}
#IBOutlet var productDescription: UITextView!
var product: SKProduct?
let productID = "com.myCoolAwesomeApp.mjay.noAdvertisements"
#IBOutlet var buyButton: UIButton!
#IBOutlet var returnButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
buyButton.layer.cornerRadius = 5.0
returnButton.layer.cornerRadius = 5.0
buyButton.isEnabled = false
SKPaymentQueue.default().add(self)
getPurchaseInfo()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func purchase(_ sender: Any) {
let payment = SKPayment(product: product!)
SKPaymentQueue.default().add(payment)
}
#IBAction func dismissView(_ sender: Any) {
//self.dismiss(animated: true, completion: nil)
}
func getPurchaseInfo() {
if SKPaymentQueue.canMakePayments() {
let request = SKProductsRequest(productIdentifiers: NSSet(objects: self.productID) as! Set<String>)
request.delegate = self
request.start()
} else {
productDescription.text = "Please enable In App Purchases in your settings."
}
}
func productsRequest(_ request: SKProductsRequest, didReceive response: SKProductsResponse) {
var products = response.products
if (products.count) == 0 {
productDescription.text = "Product not found."
} else {
product = products[0]
productDescription.text = "Remove all advertisements within the game for $0.99"
buyButton.isEnabled = true
}
let invalids = response.invalidProductIdentifiers
for product in invalids {
print("Product not found: \(product)")
}
}
func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
for transaction in transactions {
switch transaction.transactionState {
case SKPaymentTransactionState.purchased:
SKPaymentQueue.default().finishTransaction(transaction)
productDescription.text = "Purchase Successful"
buyButton.isEnabled = false
let save = UserDefaults.standard
save.set(true, forKey: "Purchase")
save.synchronize()
case SKPaymentTransactionState.failed:
SKPaymentQueue.default().finishTransaction(transaction)
productDescription.text = "Purchase Failed. Try again later."
default:
break
}
}
}
}