To change payment methods for each subscription so you can apply different payment forms to each subscription, follow these steps.
1. Log into My Account.
2. Select Subscriptions tab
3. Click View button on right of active subscription
4. That subscription will pop open. Then click on Change Payment button.
5. You will be redirected to the Checkout. Note this will not make a new purchase today. It will change the payment method for the next subscription renewal.
6. Next select credit card.
7. Enter your credit card number, expiration & CVC code
8. Finally click on the Change payment method button
8. Repeat the steps for each active subscription if necessary.