curl --request GET \
  --url https://{cluster}.voucherify.io/v1/rewards/{rewardId} \
  --header 'Authorization: Bearer <token>' \
  --header 'X-App-Id: <api-key>' \
  --header 'X-App-Token: <api-key>'

{
  "id": "rew_nIy4gHpQHle2c3pNMwuj7G6j",
  "name": "<string>",
  "stock": 123,
  "redeemed": 123,
  "attributes": {
    "image_url": "<string>",
    "description": "<string>"
  },
  "metadata": {},
  "type": "CAMPAIGN",
  "parameters": {
    "campaign": {
      "id": "<string>",
      "balance": 123,
      "type": "DISCOUNT_COUPONS"
    }
  },
  "created_at": "2022-08-11T14:49:22.586Z",
  "updated_at": "2022-08-11T16:01:34.885Z",
  "object": "reward"
}