Our billing system runs on every 1st day of a new month. In this billing run the usage of your servers is calculated for the previous month. You are charged afterwords. If you have setup a recurring payment method like a credit card we will use this to pay the invoice. We will first use the balance from your VPSServer account.
If you do not use a recurring Payment method you can use Paypal or Bitcoins to fund your account. The amount due will be deducted from your VPSserver account balance.