If you wish to stop receiving a monthly invoice which you wish to pay manually you can setup a Automatic monthly subscription from your Paypal account. This is similar to a Banks Direct Debit.
You will first need to contact firstname.lastname@example.org or submit a ticket using the billing system asking for your payment method to be changed from a Monthly Invoice to a Monthly Subscription through Paypal. We will then activate this for you. You will then need to closely follow these steps:
Login to our billing system here: http://www.k-planet.gr/billing/clientarea.php
>> Go "My Hosting Packages" and select the package you wish to setup the subscription for by clicking "View Details"
>> You will see an overview of your account and at the bottom will be a "Pay Now" button, click this.
>> You will be forwarded to paypal where you can setup a Paypal Automatic Subscription for your account.