curl --request GET \
  --url https://sdk-api.playcamp.io/v1/server/coupons/user/{userId} \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "id": 123,
      "userId": "<string>",
      "couponCode": "<string>",
      "packageId": 123,
      "campaignId": "<string>",
      "creatorKey": "<string>",
      "usedAt": "2023-11-07T05:31:56Z"
    }
  ],
  "pagination": {
    "page": 123,
    "limit": 123,
    "total": 123,
    "totalPages": 123
  }
}