Xcode swift SKScene in app purchase

Question

I'm trying to create in app purchases on an SKScene in my game. The scene is called coinShop. Basically, an IAP that gives the user 300 coins. When I tried copying code, it said SKScene can not conform to the delegates I tried adding. If anybody knows how do in app purchases with a scene instead of a viewcontroller, I would love to know. Here is all the code relating to in app purchases

in the didMoveToView(), i have

SKPaymentQueue.defaultQueue().addTransactionObserver(self)

    requestProductInfo()

    productIDs.append("com.ClearRockTechnologies.alien-anarchy.300Coins")

and then i have the following functions

func requestProductInfo() {
    if SKPaymentQueue.canMakePayments() {
        let productIdentifiers = NSSet(array: productIDs)
        let productRequest = SKProductsRequest(productIdentifiers: productIdentifiers as Set<NSObject> )

        productRequest.delegate = self
        productRequest.start()
    }
    else {
        print("Cannot perform In App Purchases.")
    }
}






func productsRequest(request: SKProductsRequest, didReceiveResponse response: SKProductsResponse) {
    if response.products.count != 0 {
        for product in response.products {
            productsArray.append(product)
        }

    }
    else {
        print("There are no products.")
    }



    if response.invalidProductIdentifiers.count != 0 {
        print(response.invalidProductIdentifiers.description)
    }
}

func showActions() {

    let payment = SKPayment(product: self.productsArray[0] as SKProduct)
    SKPaymentQueue.defaultQueue().addPayment(payment)
    //self.transactionInProgress = true
}


func paymentQueue(queue: SKPaymentQueue!, updatedTransactions transactions: [AnyObject]!) {
    for transaction in transactions as! [SKPaymentTransaction] {
        switch transaction.transactionState {
        case SKPaymentTransactionState.Purchased:
            print("Transaction completed successfully.")
            SKPaymentQueue.defaultQueue().finishTransaction(transaction)
            coins+=300
            NSUserDefaults.standardUserDefaults().setInteger(coins, forKey: "coins")
        case SKPaymentTransactionState.Failed:
            print("Transaction Failed");
            SKPaymentQueue.defaultQueue().finishTransaction(transaction)

        default:
            print(transaction.transactionState.rawValue)
        }
    }
}

and here are my two errors,

1. Type 'coinShop' does not conform to protocol 'SKPaymentTransactionObserver'

2. 'NSSet' is not implicitly convertible to 'Set'; did you mean to use 'as' to explicitly convert?

Error 1 has no suggestion, and error 2 tells me to add as "Set< NSObject >" to this line let productRequest = SKProductsRequest(productIdentifiers: productIdentifiers as Set<NSObject> ) but I clearly already have that. Any help would be appreciated.