Here is the description of response attributes, which returns to the form of JSON.
It will return a success message if API is executed successfully.

Attribute	Description
id	This contains the discount coupon id for ticketing.
code	This contains the name of discount code, e.g. CODE20, CODE50 etc.
amount	This contains the amount to be discounted.
couponUsed	This will return the number of coupons used.
maximumUseOfCoupon	This will return the maximum number of times a coupon can be used.
maximumUseOfCouponPerUser	This will return the maximum number of times a coupon can be used per user.
startDate	This contains the discount start date, e.g. "10/19/2021 11:24:00"
endDate	This contains the discount end date, e.g. "11/10/2021 16:45:00"
eventTicketTypeId	This contains the event ticket type id for discount.
discountType	This will return the discount type like PERCENTAGE or FLAT.
applicableTo	This will return the discount applicable to PER_TICKET or PER_ORDER.
recurringRelativeStartTime	This contains the coupon start time from XX hours before recurring event starts.
recurringRelativeEndTime	This contains the coupon end time from XX hours before recurring event ends.
recurringEventId	This contains the recurring event id for an in-person event. If this doesn't exist, it's otherwise null.

Here are the possible error messages, which return if any condition gets failed or required data is missing for processing.

Error Code	Error Description
200	array of discount code.
400	The request could not be understood by the server due to malformed syntax.
401	The request could not be understood by the server due to malformed syntax.
403	Accessing the resource you were trying to reach is forbidden.
404	The resource you were trying to reach is not found.
4030201	Not Event Host.