You can add a new credit card to your account via the Billing -> Credit Cards section of the RBLTracker portal:
RBLTracker currently supports: Visa, Mastercard, American Express, Discover, Diners Club, and JCB
Please note: your credit card information is NEVER stored on the RBLTracker system, and is never passed in an non-secure manner.
All cardholder information and payments are handled directly via Stripe – a certified PCI Level 1 provider. Stripe is trusted by companies like: Twitter, Kickstarter, Shopify, Pinterest, and more.