Error when calling in App Purchase - quick

I've had this problem before! It is very easy to fix. Make sure you sign out of the app store with your regular account and iTunes.

The next time you test your IAP on your device, log into your account in the sandbox view. It should work.

Also, if that doesn't fix your problem, take a look at this: My IAP isn't working. Func Paymentqueue errors

It contains my code for IAP (which works) and some tips to fix some problems. I hope this answer was helpful;)

Here is the complete IAP code:

import UIKit
import StoreKit


class GameViewController: UIViewController, ADBannerViewDelegate, SKProductsRequestDelegate, SKPaymentTransactionObserver, GKGameCenterControllerDelegate,GADBannerViewDelegate{


    @IBOutlet var outRemoveAds: UIButton!
    @IBOutlet var outRestorePurchases: UIButton!


    override func viewDidLoad() {
        super.viewDidLoad()

    }

    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)

        if NSUserDefaults.standardUserDefaults().objectForKey("val") != nil {
            print("Has a value.")
            banner.removeFromSuperview()
            bannerGoogle.removeFromSuperview()
            outRemoveAds.removeFromSuperview()
            outRestorePurchases.removeFromSuperview()
            removeInterFrom = 1
        }
        else {
            print("No Value.")
        }

        if(SKPaymentQueue.canMakePayments()){
            print("IAP is enabled, loading...")
            let productID:NSSet = NSSet(objects:"IAP id")
            let request: SKProductsRequest = SKProductsRequest(productIdentifiers: productID as! Set<String>)
            request.delegate = self
            request.start()
        }
        else{
            print("Please enable IAPS")

        }

    }


    //IAP Ads

    @IBAction func removeAds(sender: UIButton) {
        for product in list{
            let prodID = product.productIdentifier
            if (prodID == "IAP id"){
                p = product
                buyProduct()
                break
            }
        }
    }
    @IBAction func restorePurchases(sender: UIButton) {
        SKPaymentQueue.defaultQueue().restoreCompletedTransactions()
    }


    //IAP Functions

    var list = [SKProduct]()
    var p = SKProduct()

    func removeAds(){
        banner.removeFromSuperview()
        bannerGoogle.removeFromSuperview()
        outRemoveAds.removeFromSuperview()
        outRestorePurchases.removeFromSuperview()
        let theValue = 10
        NSUserDefaults.standardUserDefaults().setObject(theValue, forKey: "val")
        NSUserDefaults.standardUserDefaults().synchronize()
    }

    func buyProduct(){
        print("Buy: "+p.productIdentifier)
        let pay = SKPayment (product: p)
        SKPaymentQueue.defaultQueue().addPayment(pay as SKPayment)
    }

    func productsRequest(request: SKProductsRequest, didReceiveResponse response: SKProductsResponse) {
        print("Product Request")
        let myProduct = response.products

        for product in myProduct{
            print("Product Added")
            print(product.productIdentifier)
            print(product.localizedTitle)
            print(product.localizedDescription)
            print(product.price)

            list.append(product as SKProduct)
        }
    }

    func paymentQueue(queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
        print("Add Payment")

        for transaction:AnyObject in transactions{
            let trans = transaction as! SKPaymentTransaction
            print(trans.error)
            switch trans.transactionState{
            case .Purchased:
                print("IAP unlocked")
                print(p.productIdentifier)

                let prodID = p.productIdentifier as String
                switch prodID{
                case "IAP id":
                    print("Remove Ads")
                    removeAds()
                default:
                    print("IAP not setup")
                }
                queue.finishTransaction(trans)
                break
            case .Failed:
                print ("Buy error")
                queue.finishTransaction(trans)
                break
            default:
                print("default: Error")
                break
            }
        }
    }

    func paymentQueueRestoreCompletedTransactionsFinished(queue: SKPaymentQueue) {
        print("Purchases Restored")

        _ = []
        for transaction in queue.transactions {
            let t: SKPaymentTransaction = transaction as SKPaymentTransaction

            let prodID = t.payment.productIdentifier as String
            switch prodID{
            case "IAP id":
                print("Remove Ads")
                removeAds()
            default:
                print("IAP not setup")
            }


        }
    }
    func finishTransaction(trans:SKPaymentTransaction){
        print("Finshed Transaction")
    }

    func paymentQueue(queue: SKPaymentQueue, removedTransactions transactions: [SKPaymentTransaction]) {
        print("Remove Transaction")
    }
}

      

        
        
        
      

    

Put:

SKPaymentQueue.defaultQueue().addTransactionObserver(self) 

      

        
        
        
      

    

in viewDidLoad or viewDidAppear