Payment safety is our priority. While processing your payment, you will be taken to the GP Webpay payment portal, a 3D Secure payment gateway, which was created in cooperation with a reputable bank. AppOnFly staff will therefore not be able to find out your card number and details and will only see whether or not a payment has been successful.
Furthermore, your data is safe with us. Data is encrypted and neither our employees nor bank employees will have access to it. Encrypted communication with our servers is indicated through the addition of the URL 3dsecure.gpwebpay.com, as well as a padlock symbol, indicating the presence of a security certificate, in your browser's navigation bar.
You can read more here http://www.gpwebpay.cz/en/Security