Set rules once: bulky-item surcharges, bottle deposits, Sunday or small-order fees, gift wrapping to tick. Each fee appears as its own named line in the cart, with an optional note for the customer, and checkout makes sure required fees are paid. Conditions cover products, collections, tags, weight, quantity, cart value, weekday, date and market; payment and delivery method on Shopify Plus. Discounts work the same way. A preview shows the result before you save.

• Required fees as named cart lines, enforced at checkout
• Opt-in fees the customer ticks, such as gift wrapping
• Conditions on products, tags, weight, cart value, date and market
• Announce fees on the product page before they reach the cart
• Fee log with CSV export for your accounting