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

{
  "object": "list",
  "data_ref": "vouchers",
  "vouchers": [
    {
      "id": "v_YLn0WVWXSXbUfDvxgrgUbtfJ3SQIY655",
      "code": "0PmQ7JQI",
      "campaign": "Loyalty Campaign",
      "campaign_id": "camp_7s3uXI44aKfIk5IhmeOPr6ic",
      "category": null,
      "category_id": null,
      "categories": [],
      "type": "LOYALTY_CARD",
      "discount": null,
      "gift": null,
      "loyalty_card": {
        "points": 0,
        "balance": 0
      },
      "start_date": null,
      "expiration_date": null,
      "validity_timeframe": null,
      "validity_day_of_week": null,
      "active": true,
      "additional_info": null,
      "metadata": {},
      "assets": {
        "qr": {
          "id": "U2FsdGVkX19RtPewWeUYb2hiCR6xEhVE3SLdMfCXj3BA/s6uqSwFl2oAKAt9K5dolsdcZcj5Jgaa/YCnKkm63TRuX6OgGJoEggbKMg+wLfCMwBSi4J2v8KXuyqM25wP4r9WAL58Z+z3B1jkALIbjtw==",
          "url": "{{internalVoucherifyURL}}"
        },
        "barcode": {
          "id": "U2FsdGVkX1+hrRfaPMHRRX5aGVz2RpurRBjC2brcHcptPs4Od93qZM51vUXZe4DDzfRbnVrP+BfBtF+pyyQpxCeqbQuB/OuSnP/nzec6n0n/gTb9+XcIYLvvxcbnDbYoVdRFQEbcCxKKo4QzDlqIjQ==",
          "url": "{{internalVoucherifyURL}}"
        }
      },
      "is_referral_code": false,
      "created_at": "2022-04-15T05:48:45.509Z",
      "updated_at": "2022-07-01T00:01:57.860Z",
      "holder_id": "cust_nk0N1uNQ1YnupAoJGOgvsODC",
      "redemption": {
        "quantity": null,
        "redeemed_quantity": 0,
        "redeemed_points": 0,
        "object": "list",
        "url": "/v1/vouchers/0PmQ7JQI/redemptions?page=1&limit=10"
      },
      "publish": {
        "object": "list",
        "count": 1,
        "url": "/v1/vouchers/0PmQ7JQI/publications?page=1&limit=10"
      },
      "object": "voucher"
    },
    {
      "id": "v_0aMj6Mdp0i3zuXrd9NnBKboc7746mlgF",
      "code": "MmFAzfDe",
      "campaign": "Loyalty Campaign",
      "campaign_id": "camp_7s3uXI44aKfIk5IhmeOPr6ic",
      "category": null,
      "category_id": "cat_0b6152ce12414820de",
      "categories": [],
      "type": "LOYALTY_CARD",
      "discount": null,
      "gift": null,
      "loyalty_card": {
        "points": 13435,
        "balance": 13135,
        "next_expiration_date": "2022-11-30",
        "next_expiration_points": 12
      },
      "start_date": null,
      "expiration_date": null,
      "validity_timeframe": null,
      "validity_day_of_week": null,
      "active": true,
      "additional_info": null,
      "metadata": {},
      "assets": {
        "qr": {
          "id": "U2FsdGVkX184kVdWUO/msrLg1G0MRf/Cs6QwSN3f6kyWCOTGdijyq8OfUbUpcGx6fjdeIpTf2UilFGNG8aCWVk/dXm/QEJ/sulXKDlUMWf+MN7TRG5LB+wuzqTy7csDBfRoJn0fURpwU4A6VZZSwBQ==",
          "url": "{{internalVoucherifyURL}}"
        },
        "barcode": {
          "id": "U2FsdGVkX1/RGZN9VwvkdI6B26PPZQZWjh33USr5NPMXbHuJVkxsH6TUyW/cXen1Lc7gaqik09BGiry0R4QIAP52jnxQuABOsW0HdYfglsLPY7IajGX5rJzZKDKuzioq2vRIPyuE6z03frAod7ptvQ==",
          "url": "{{internalVoucherifyURL}}"
        }
      },
      "is_referral_code": false,
      "created_at": "2022-02-18T14:03:59.954Z",
      "updated_at": "2022-11-21T13:49:54.949Z",
      "holder_id": "cust_sehkNIi8Uq2qQuRqSr7xn4Zi",
      "redemption": {
        "quantity": null,
        "redeemed_quantity": 1,
        "redeemed_points": 300,
        "object": "list",
        "url": "/v1/vouchers/MmFAzfDe/redemptions?page=1&limit=10"
      },
      "publish": {
        "object": "list",
        "count": 1,
        "url": "/v1/vouchers/MmFAzfDe/publications?page=1&limit=10"
      },
      "object": "voucher"
    }
  ],
  "total": 2
}