curl --request GET \
  --url https://uat-api.clinkbill.com/api/coupon \
  --header 'X-API-KEY: <api-key>' \
  --header 'X-Timestamp: <api-key>'

{
  "total": 123,
  "rows": [
    {
      "couponId": "<string>",
      "couponName": "<string>",
      "percentage": 123,
      "fixedAmounts": {},
      "durationMonths": 123,
      "maxRedemptionCount": 123,
      "redeemedCount": 123,
      "validPeriodEnd": 1754819711382,
      "mirroring": true,
      "terms": "<string>"
    }
  ],
  "code": 200,
  "msg": "success"
}