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

{
  "object": "list",
  "data_ref": "data",
  "data": [
    {
      "id": "ltr_7rVIPlPzdSFwpnbCcUXgwzH2",
      "name": "Tier 1 - Top",
      "campaign_id": "camp_fkZ28pe7DUAEmmabofkxHI8N",
      "metadata": {
        "has_funds": true
      },
      "created_at": "2022-11-09T06:26:54.797Z",
      "updated_at": "2022-11-25T11:27:58.578Z",
      "earning_rules": {
        "ern_95aq3JaE5A8xzHjoJPYNRqXZ": {
          "type": "MULTIPLY",
          "multiplier": 3
        },
        "ern_AdlWO2yt6b6llWsibIdiRXVE": {
          "type": "MULTIPLY",
          "multiplier": 5
        },
        "ern_HnRXyJHoj3E79r3KUWhgMgtD": {
          "type": "MULTIPLY",
          "multiplier": 3
        },
        "ern_raVUcdXruvXGuzm682ESrAzt": {
          "type": "CUSTOM",
          "points": 200
        }
      },
      "rewards": {
        "rewa_Or6gWZ5ASuGkBLjOf0IyiD4k": {
          "type": "CUSTOM",
          "points": 300
        }
      },
      "config": {
        "points": {
          "from": 500,
          "to": 1000
        }
      },
      "points": {
        "from": 500,
        "to": 1000
      },
      "expiration": {
        "customer_id": "cust_qBwHpagDOFu71Z3F22UzR80X",
        "campaign_id": "camp_fkZ28pe7DUAEmmabofkxHI8N",
        "tier_id": "ltr_7rVIPlPzdSFwpnbCcUXgwzH2",
        "start_date": "2022-11-10",
        "expiration_date": "2023-02-28",
        "created_at": "2022-11-09T11:26:26.719Z",
        "updated_at": "2022-11-10T08:54:47.200Z"
      },
      "object": "loyalty_tier"
    }
  ],
  "total": 1
}