QR Code funktioniert nicht

You can choose the following subscription methods： 1-month with 3-day trial, 3-month, 1-year. -The application is free to download, and provides limited use of QR code styles, creation and use of limited types of QR codes, and free scanning of QR codes and barcodes.  However, you are not able to cancel the current subscription during its active period. - Subscriptions are linked to your account rather than to a given installation of an app on a device.  You may cancel a subscription during its free trial period via the subscription setting through your iTunes account.  Therefore cancelling a free trial or subscription must be done via your account Settings.  Subscription automatically renews for the same price and duration period unless auto-renew is turned off at least 24-hours before the end of the current period.  You may turn off the auto-renewal of your subscription via your iTunes account settings.  Account will be charged for renewal within 24-hours prior to the end of the current period at the cost of the chosen package.  No cancellation of the current subscription is allowed during active subscription period.  You can subscribe for unlimited use of all styles and functions. - Payment is charged to iTunes Account at confirmation of purchase.  Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's iTunes Account Settings after purchase.  This must be done 24 hours before the end of the subscription period to avoid being charged.  Just deleting the app does not automatically cancel a subscription.  You can subscribe to enjoy your exclusive privileges：unlimited scans, Advanced QR code production，More styles and no ads!  This is an application that focuses on QR code scanning and production, barcode recognition and search. 1.  A variety of styles to choose, quickly make an exclusive QR code. 2.  Scan product barcodes to quickly grasp product information. 3. 5.