Step 1.
Log-in to the client's account then click Account Information and View Shopping Cart.
Step 2.
Click the Add button to add any plan or item to the cart.
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Step 3.
Click the continue to check-out button. Don't worry, this will not result in a charge to their card.
Step 4.
On the next screen, click the Add a Payment Profile:
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Step 5.
Use the pop-up window provided to enter and submit the relevant credit card information.
Step 6.
Click the Modify Your Order button and then click the red X to remove the item from their cart:
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The item will go away, but the payment profile you entered will remain.