Invoice Maker Business Receipt funktioniert nicht

With Invoice Maker, you'll be invoicing your customers in no time and sending professional PDF invoices with ease.  The free version of Invoice maker can be used to create a limited number of invoices.  Invoice Maker is a fast and easy invoice app for sending invoices and estimates to your customers.  Invoice Maker adds the great features above and are available through an auto-renewing subscription.  Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. 
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11.  Create, send and track invoices and estimates easily on your phone.  Send your first free invoice today with the #1 invoice app. 1. 2. 
4. 5.  Perfect for small business owners, contractors and freelancers needing a simple and professional mobile invoicing solution.  Send the invoice before you even leave the customer!  You can upgrade in-app to create an unlimited number of invoices.  Subscriptions will be charged to your credit card through your iTunes account.  Manage all of your billing while on the go so you can get paid faster.  Your subscription will automatically renew unless cancelled at least 24 hours before the end of your current subscription, and you can cancel a subscription during the active period.