Quote Originally Posted by mauryg View Post
That sounds really weird to me since all the information for the shipping address should be in your database unless you are bypassing the checkout_shipping page like PayPal Express wants to do or your customer is not logged in to your site in order to make a purchase. You might want to rethink your checkout procedure.
But I thought zen-cart also stored a copy of the address locally on the way back... but yea if there is no shipping address in the database, then usps contrib won't be able to find it.