It's easy to update and change your payment details!
You can change your payment details in your Account Settings. On the website you can get to the page to update your payment details by clicking on:
Menu>Account Settings>Subscription>Payment Update
Enter your new card information on the page, and click the "update" button. This card will now be used for your future purchases on Cambly!
The images below will help you navigate to the correct place to update your payment details: