Hi Denis,
If you find that your buyers are entering their billing zip code in the cart rather than their shipping zip code then it is possible to edit the zip code prompt to make it more clear that the zip code added in the cart is the -shipping- zip code and not the -billing- zip code. We don't lock in billing addresses, only the shipping address. If a buyer enters their shipping zip code in the cart they are not going to have an issue at checkout.
To customize the shopping cart you must be using one of our regular, javascript enabled View Cart buttons. Add the following code to your cart button, just before the // --> line in the standard code you obtained from Seller Admin:
function EJEJC_config() {
EJEJC_POSTCALL=true;
}
function EJEJC_shown() {
jQuery("#state1").attr("innerHTML", "Shipping Zip Code");
}
This will change the cart's default text of "ZIP/Postal Code" to "Shipping Zip Code"
Further information about cart customization can be found here;
http://www.e-junkie.com/ej/help.custom-cart.htm