Coupons can only be applied at the time of order placement.
If a coupon was not applied during checkout, it cannot be applied after payment is completed.
In this case, you may cancel the entire order and place a new one using the coupon or promotion code.
To avoid this issue, please double-check that your coupon is properly applied before making payment.
When an order is canceled, any used points or coupons will be automatically restored to your account, as long as they are still within the validity period.
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