Markate charges your credit card based on your Monthly / yearly subscription plan dates. (If auto renewal is ON)
We suggest you to store the card and enable the auto charge option to avoid disruption of our service.
Note: Markate runs in a secure server with all communication over an encrypted data connection similar to that used by banks. We are PCI compliant (certified by Visa, Mastercard, American Express and Discover), we do not store passwords and we do not store credit card information.
Here is a link showing you how to save your card