You can view and manage your saved payment methods at any time through your My Mirror profile. Here's how:
Log in to your My Mirror account and click the dropdown arrow next to your name.
Select Profile and scroll down to Payment methods.
Here you can view any cards already saved to your account.
To add a new card, enter your details and click Save your payment method.
If you have more than one card saved, you can select which one is your primary payment method.