You’ll always be able to change your payment method, or add a new backup one .
To do so, log into the platform, and click on the "Manage Plan" button, in the top right corner of the page.
A popup will open up, showing you your subscription details.
Click on "Payment Methods".
You’ll see your current payment method(s) listed.
You'll be now able to:
Click on "Add new" to add a new backup method,
Click on the current Payment method to edit the related information.
When you are done, click on “Update”.
Pretty easy right?