I need some help from you guys. Actually what I want is an extension or any other way thru which when a person add a product to cart and clicks on Checkout button, he fills his details like Name, email Id etc. Now, by default we can calculate shipping and charge him accordingly. But what I want is that there should be a text box where they can enter there 6 character UPS Account Number or 9 digit FedEx Account Number i.e. the ability to take UPS and FedEx account numbers, validate that they are the right number of characters and charge $0 for shipping when they are entered. I have attached an image file showing my exact requirement (please see on left side of image under SHIPPING OPTIONS).
Click thumbnail to see full-size image
