As we use Paypal for payments and Apple does not allow payment in apps using this service. But our website is adapted to mobile devices, so it's easy to pay by phone or tablet. Directly from the menu of the website you can login, and then tap the pay button at the bottom next to the outstanding invoice. After this you'll be taken to the Paypal payment page. After you log on to our website, all communication between your device, our server and Paypal course secured with encryption.