curl --request PUT \
  --url https://{cluster}.voucherify.io/v1/campaigns/{campaignId} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'X-App-Id: <api-key>' \
  --header 'X-App-Token: <api-key>' \
  --data '{
  "description": "New description"
}'

{
  "id": "camp_FZL4iTTdZw36nZOoXYQ172fQ",
  "name": "Loyalty Campaign",
  "campaign_type": "LOYALTY_PROGRAM",
  "type": "AUTO_UPDATE",
  "voucher": {
    "type": "LOYALTY_CARD",
    "loyalty_card": {
      "points": 1000,
      "expiration_rules": {
        "period_type": "MONTH",
        "period_value": 3,
        "rounding_type": "END_OF_YEAR"
      }
    },
    "redemption": {
      "quantity": 10
    },
    "code_config": {
      "length": 7,
      "charset": "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ",
      "pattern": "LOYALTY-CARD-#######"
    },
    "is_referral_code": false,
    "start_date": "2020-08-16T00:00:00.000Z",
    "expiration_date": "2023-12-26T00:00:00.000Z",
    "validity_timeframe": {
      "interval": "P2D",
      "duration": "P1D"
    }
  },
  "auto_join": false,
  "join_once": false,
  "use_voucher_metadata_schema": false,
  "description": "New description",
  "start_date": "2020-08-16T00:00:00.000Z",
  "expiration_date": "2023-12-26T00:00:00.000Z",
  "validity_timeframe": {
    "interval": "P2D",
    "duration": "P1D"
  },
  "validity_day_of_week": [
    0,
    1,
    2
  ],
  "activity_duration_after_publishing": "P24D",
  "vouchers_count": 2,
  "active": true,
  "metadata": {
    "region": "APAC"
  },
  "created_at": "2022-09-21T09:39:45.479Z",
  "updated_at": "2022-09-23T09:47:00.205Z",
  "category": "First",
  "creation_status": "MODIFYING",
  "vouchers_generation_status": "MODIFYING",
  "protected": false,
  "validation_rules_assignments": {
    "object": "list",
    "data_ref": "data",
    "data": [],
    "total": 0
  },
  "category_id": "cat_0bb343dee3cdb5ec0c",
  "categories": [
    {
      "id": "cat_0bb343dee3cdb5ec0c",
      "name": "First",
      "hierarchy": 1,
      "created_at": "2022-09-16T11:47:19.568Z",
      "object": "category"
    }
  ],
  "object": "campaign"
}