Supermassive charges monthly fees for its Guildhouse and Network Memberships. Renewals occur each month, on the anniversary of your purchase date.
For example, if you sign up on June 15th, you will renew on July 15th and on every subsequent 15th of the month.
Please note that Supermassive currently requires that you use a credit card to purchase a membership. Your payment information is stored in Recurly, our subscription engine. Recurly is PCI-DSS Level 1 compliant; please refer to their website for more details.