App Startup

Complete Pending Transactions

Apple recommends to register a transaction observer as soon as the app starts:

Adding your app's observer at launch ensures that it will persist during all launches of your app, thus allowing your app to receive all the payment queue notifications.

SwiftyStoreKit supports this by calling completeTransactions() when the app starts:

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
	// see notes below for the meaning of Atomic / Non-Atomic
	SwiftyStoreKit.completeTransactions(atomically: true) { purchases in
	    for purchase in purchases {
	        switch purchase.transaction.transactionState {
	        case .purchased, .restored:
	            if purchase.needsFinishTransaction {
	                // Deliver content from server, then:
	                SwiftyStoreKit.finishTransaction(purchase.transaction)
	            }
	            // Unlock content
	        case .failed, .purchasing, .deferred:
	            break // do nothing
	        }
	    }
	}
    return true
}

If there are any pending transactions at this point, these will be reported by the completion block so that the app state and UI can be updated.

If there are no pending transactions, the completion block will not be called.

Note that completeTransactions() should only be called once in your code, in application(:didFinishLaunchingWithOptions:).