Perform receipt verification when app starts

SwiftyStoreDemo/AppDelegate.swift

@@ -32,11 +32,27 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
 
     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey : Any]? = nil) -> Bool {
 
+        verifyReceipt()
+
         completeIAPTransactions()
-        
+
         return true
     }
     
+    func verifyReceipt() {
+        
+        SwiftyStoreKit.verifyReceipt(password: "your-shared-secret") { result in
+            switch result {
+            case .success(let receipt):
+                print("\(receipt)")
+            case .error(let error):
+                if case .noReceiptData = error {
+                    SwiftyStoreKit.refreshReceipt { result in }
+                }
+            }
+        }
+    }
+    
     func completeIAPTransactions() {
         
         SwiftyStoreKit.completeTransactions() { completedTransactions in

SwiftyStoreDemo/ViewController.swift

@@ -148,7 +148,7 @@ class ViewController: UIViewController {
 
     func refreshReceipt() {
 
-        SwiftyStoreKit.refreshReceipt { (result) -> () in
+        SwiftyStoreKit.refreshReceipt { result in
 
             self.showAlert(self.alertForRefreshReceipt(result))
         }