Add/manage payment methods for your MxU subscription.
You can manage your payment method by navigating here and clicking Manage Subscription.
From there, you'll find the ability to + add payment method as well as remove ( x ) an old one. All major credit/debit card providers are accepted. Keep in mind that payment methods may not be removed until a new default has been added. If you'd like to remove all payment methods from MxU, first you must cancel your subscription.