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

{
  "code": 200,
  "msg": "success",
  "data": [
    {
      "couponId": "<string>",
      "promotionCodeId": "<string>",
      "code": "<string>",
      "status": "active",
      "firstOrderOnly": true,
      "redemptionCount": 123,
      "maxRedemptionLimit": 123,
      "validPeriodEnd": 1754819711382,
      "createTime": 1754819711382,
      "mirroring": true
    }
  ]
}