You can manage your payment methods from the Billing section of your account:
You can also get there by going to Settings → Admin → Billing.
Manage your payment methods
Go to Billing in your Admin settings.
Select the Overview tab.
Find the Payment Methods section.
From here, you can view the payment methods currently associated with your account, add a new card, or delete an existing card.
Any new payment method you add will be available for future OpenAssistant subscription and billing charges.

