curl --request POST \
  --url https://api.voucherify.io/v2/loyalties/rewards/{id}/activate \
  --header 'Authorization: Bearer <token>' \
  --header 'X-App-Id: <api-key>' \
  --header 'X-App-Token: <api-key>'

{
  "id": "<string>",
  "name": "<string>",
  "metadata": {},
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "object": "<string>",
  "material": {
    "product": {
      "id": "<string>"
    },
    "sku": {
      "product_id": "<string>",
      "id": "<string>"
    }
  },
  "digital": {
    "discount_coupons": {
      "campaign_id": "<string>"
    },
    "gift_vouchers": {
      "campaign_id": "<string>",
      "balance": 1
    }
  }
}