curl --request GET \
  --url https://uat-api.clinkbill.com/api/promotion-code/{id} \
  --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,
    "customers": [
      {
        "customerId": "<string>",
        "name": "<string>",
        "email": "<string>"
      }
    ],
    "perCustomerRedemptionLimit": 123,
    "minimumSpend": {},
    "currency": "<string>",
    "amount": 123
  }
}