Coupons are used to add a variable, flat rate or percentage rate discount. This will subtract the coupon value from the total.
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Removing A Coupon From An Order
Adding A Coupon To An Order Maintaining An Order Overview Changing The Marketplace/Site Of A Manual Order View Pending Orders Adding An Item To An Order Adding A Fee To An Order Removing An Item Or Fee From An Order Updating Unsellable Items On An Order Removing A Coupon From An Order Adding A Payment To An Order