Add a Discount Coupon to a Sales Order in Control Panel
Warning: If possible, discount coupons should only be applied when creating the order. Adding a discount coupon to an existing order is not recommended, especially if the order is already paid or has been approved at any time, as it will modify the amount owed to the customer.
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In your Maropost Commerce control panel navigate to Orders > View Orders and edit an order or Add Order if you are creating a new one.
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Underneath the product lines you will see Coupons and Discount Codes where you can add discount or coupon codes.
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Click Apply Discount(s) to order.

Add a Discount Coupon to an Order in Checkout
Add products to the cart and go to the checkout. Depending on the theme, this will appear on the top right hand side of the checkout or the bottom where you can enter a coupon or discount code.
