If you are trying to change the Expiry days for a coupon campaign after the coupons are generated, and keep it as 0 consider the End Date of the coupon campaign, this will not bring any effect to the generated coupons. The expiry for the generated codes will be the same as initially configured i.e. If the initial expiry is set to 5 days and even if a coupon is generated on the last date of the campaign it will be valid for 5 days.
Once the coupons are generated using a campaign where the number of expiry days is defined, the coupons will be valid for the defined number of days only.
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