This plugin includes our Cart module as part of the plugin package at no extra charge. Our Cart module includes a 3-level Affiliate System for all sales (including Membership Sales), User Invoicing with Automated Due/Overdue reminders, integration with the Phpfox Payment Gateway System, location-based Tax rate options, weight-based shipping options, Monthly Sales & Earnings Reports, Coupons and multi-item Packaging options, and more!