Yahoo shopping cart, checkout page depends on the cookies. If visitor's browser cookies are disable, yahoo store will be unable to add those products at shopping cart section. Shopping Cart Cookie tester will enable the alert message for customer to enable the browser cookies to purchase the products.

Shopping cart cookie tester will help you to prevent from loosing business. Helps your customer to find why the product is not added to checkout page and will help both you and customer to bulid relationship with eachother through the website.