Cart66 Shopping Cart Plugin Mod -PHP

[login to view URL] [login to view URL] I require mandatory information from customers when they order from us. I want to make the field on the cart page REQUIRED before they are sent to checkout. I understand this may be a custom mod. So detailed instructions to give to a developer would be great Our use case and problem is that we have hundreds of orders per day and hundreds of clients forget to provide us with the required information we need to complete there orders. We have to email them 1 by 1 ALL DAY to get this info. This makes this solution almost unusable. We need to collect this customer info on the cart page before they by. And make it REQUIRED FIELD. Thanks [login to view URL] [login to view URL]