X-Cart shopping cart for a nail polish supplier

We have developed an X-Cart shopping cart for a nail polish supplier. Implemented customizations to the checkout flow in X-Cart to force user to order a minimum quantity (at least 4 items). Integrated UPS API for shipping charge calculation and implemented custom calculation of shipping charge to be applied once for a set number of items based on weight and quantity. Implemented custom tax chart to use tax amounts based on product quantity.