Opening an account is simple: just go to the register page and follow the instructions. As soon as your application has been approved you will receive an email containing your username and password. When you login, go to the client area to see your rate list, download invoices and whitelist new IP addresses.
Voicebroker is solely a prepaid service. You set up your payment plan by going to your client area and selecting your preferred payment method from the list of options. These require PayPal, credit card, bank transfer and, for Dutch clients, IDEAL. Every client can make a couple of test calls before making a pre-payment.