Log in to AILA Shop and click on the symbol of a person near the top-right of the page.
This will open your Order History. You can filter the items you see to just the one in which you're using a payment plan. On the left side of the page, click on the drop-down menu underneath "Search Open Orders," choose "Yes," then click "Apply Filter."
This should show only the item(s) in which you are using a payment plan. Click on "Order Details" on that item.
Scroll to the bottom and click on the grey "Update Payment Method" button.
Enter the card type, card number, the name on the card, the card's expiration date, and the card's CVV code. Click "Update Payment Information" when you're done.
Contact Membership@AILA.org for more information.