Apply mandatory deposits and required charges to products and carts. Set fixed fees per unit, per product, or per cart, and target products or collections. Fees appear as clearly labelled cart lines and stay synchronized with quantity changes. Checkout validation checks for missing or incorrect fees. Requires the Online Store theme app embed. Optional add-ons, tips, donations, POS, and draft orders are not supported.

• Apply fixed mandatory fees per unit, per product, or per cart.
• Target products, collections, all products, or shippable products.
• Keep fee quantities synchronized and check required fees at checkout.