Single month memberships can be done by cancelling your membership right after you paid for the first month. We don't have a cancellation period so this works well.
You can also pay in advance with our "one-time payments". Just go to the upgrade page and click on the button for getting premium. A window appears which offers two tabs at the top: Monthly and One time
Click on "one time" and now you can choose the duration of your membership. We offer 3, 6 and 12 months memberships. For 6 and 12 months you even get a discount for paying in advance.
For one-time payments you pay with PayPal and don't need a credit card!