This is the default setting from our Payment Processor (BraintreePayments.com - a Paypal Subsidiary).

This enables them to store your details so in case you wish to top up in the future, you can do it with one click.

We would never charge you anything without your permission and we never process any payments manually.

You can easily break the billing agreement from your Paypal control panel. You would, however, need to re-add your details on every payment