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

{
  "id": "camp_JlsseNSDO7l4neFtev6p6945",
  "name": "$20 OFF Entire Order",
  "campaign_type": "DISCOUNT_COUPONS",
  "type": "AUTO_UPDATE",
  "voucher": {
    "type": "DISCOUNT_VOUCHER",
    "discount": {
      "type": "AMOUNT",
      "amount_off": 2000,
      "effect": "APPLY_TO_ORDER"
    },
    "redemption": {
      "quantity": null
    },
    "code_config": {
      "length": 8,
      "charset": "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ",
      "pattern": "########",
      "prefix": "$20OFFORDER-"
    },
    "is_referral_code": false
  },
  "auto_join": false,
  "join_once": false,
  "use_voucher_metadata_schema": true,
  "vouchers_count": 1,
  "active": true,
  "metadata": {},
  "created_at": "2022-07-11T09:43:36.057Z",
  "creation_status": "DONE",
  "vouchers_generation_status": "DONE",
  "protected": false,
  "validation_rules_assignments": {
    "object": "list",
    "data_ref": "data",
    "data": [],
    "total": 0
  },
  "category_id": null,
  "object": "campaign"
}