Your Card on file with us Is Charged At The Beginning of your billing cycle which could be monthly or yearly based on your plan.
You can replace your credit card with us at any point by going to Admin Settings & Clicking on Plans & Billing
Go to Payment Method(s) and you can then add your new card information in the form that appears:
Once you hit save, you're done!
Use the chatbot on the bottom right if you need more help!