The payment will be a one-time fee. However EasyMoney allows two different modes of payment.

1) If you purchase using Paypal (only option available if your country is not supported by Android Paid Apps Market):

The license key is linked to individual devices as extra protection against software piracy. The license you purchased is for 1 Android device only. However, we understand that sometimes customers need to replace their defective phones, so we provide 2 free replacement keys.

2) If you purchase via Android Paid App Market, the app will follow your Google account so no license key will be required.