A permanent discount is a coupon code that is added to a customer's account to be applied to that customer's orders.
To add a permanent discount to a customer:
Go to the Coupons page and hit Add Coupon to create the discount
Go to the customer's account page > Billing > Edit Billing and select the discount
Save
The code is automatically applied to each order created under the users account.
Note: If you need to apply the discount only to one specific order, you can go to the orders full detail page -> info tab -> edit -> coupon drop down and apply it there.
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