         
         SKPaymentQueue.defaultQueue().finishTransaction(transaction)
     }
-
+    
     private func provideContentForProductIdentifier(productIdentifier: String!) {
     
         purchasedProductIdentifiers.insert(productIdentifier)

    
    //MARK: - Helpers
    
    public func canMakePurchase() -> Bool {
        return SKPaymentQueue.canMakePayments()
    }
    
    public class func formatPrice(price: NSNumber, locale: NSLocale) -> String {
        var formattedString = ""
        

        productIdentifiers = Set<String>()
    }
    
    /**
        Add a single product ID
    
        - Parameter id: Product ID in string format
    */
    public func addProductId(id: String) {
        productIdentifiers?.insert(id)
    }
    
    /**
        Add multiple product IDs
    
        - Parameter ids: Set of product ID strings you wish to add
    */
    public func addProductIds(ids: Set<String>) {
        productIdentifiers?.unionInPlace(ids)
    }
    
    /**
        Load purchased products
    
        - Parameter checkWithApple: True if you want to validate the purchase receipt with Apple servers
    */
    public func loadPurchasedProducts(checkWithApple: Bool, completion: ((valid: Bool) -> Void)?) {
        
        if let productIdentifiers = productIdentifiers {
