You can only delete a promo code if it is not used to get a discount before.
To delete a promo code:
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Go to Discounts. The list of discounts is displayed (see Viewing the list of discounts).
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Click the ID or name of the required Promo Code discount. The discount details page is displayed (see Viewing and updating discount details).
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Go to the Promo Codes tab. The list of promo codes of the selected discount is displayed (see Viewing the list of promo codes).
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Click the ID or name of the required promo code. The promo code details page is displayed.
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Click Delete and confirm the action.
