A subscription portal is a self-service interface where customers can manage all aspects of their subscription. A great portal reduces support tickets and improves customer satisfaction. Essential portal features: - View upcoming orders - Skip, pause, or cancel - Swap products - Update payment method - Change delivery frequency - Modify shipping address - View order history - Access account settings Best practices: - Mobile-responsive design - Clear, intuitive navigation - One-click common actions - Confirmation for destructive actions - Embedded in your site (not redirect)