Automatically add physical marketing inserts to orders based on customizable rules. Add free samples to first-time buyers, thank you cards to loyal customers, or promotional flyers based on cart contents.Inserts appear as $0 line items so your 3PL or warehouse picks and packs them seamlessly. No manual work required.Track which inserts drive subscription upsells and category cross-sells with built-in conversion tracking. A/B test different inserts to optimize performance.