Products integrate deeply with the Invoice system: Products accessible via AJAX product search from invoice editor Product pricing and tax rates auto-applied to invoice line items Digital products include download buttons on invoice display Multi-currency filter respected for all product price displays Tax rates from invoice plugin used for product tax assignment Full shopping cart ecosystem for product sales: Shopping Cart - Session-based cart with add/remove products, quantity adjustment Cart Block/Shortcode - Frontend display of cart items with edit and checkout Product Listing - Frontend display of products available for purchase Checkout Block - Complete checkout form with customer/billing info collection Order Creation - Cart checkout creates Order post type (agency_pulse_order)