You can add multiple payment methods to your customer account.

To add a new payment method, login to your customer account, select the payment methods section and select the 'add a new payment method' button.

Enter your card details.

If you are a customer in the US and have payment plan with a merchant in the US, you may add a US bank account by selecting the tab, locating your bank from the list, and entering your online banking login information.

Once you have added your new payment method, locate the payment method from the payment method list.

Select the 'use for all payment plans button' to use your newly added payment method for all future installment payments.

If you have multiple open payment plans, you may use different payment methods for different payment plans. Just select the payment plan from the payment plan list, and update the payment method directly from the payment plan details by selecting the payment method from the dropdown and updating to save.