In my CartThrob {update_cart_form}, I have a Matrix-populated zip code drop-down field. When a user clicks "Checkout" I want the value of the drop-down menu to pass as a variable to the checkout page and populate the billing zip code field. Is this possible?
EDIT: You can actually view the precursor to this by going here: http://dandelionflowershop.com/index.php/website/cart
Keep in mind that you need $40 in your cart before delivery options become available.
set_active_link
tag to allow the user to change the delivery address.