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

{
  "id": "<string>",
  "name": "<string>",
  "type": "POINT_BALANCE",
  "card_definition_id": "<string>",
  "metadata": {},
  "status": "DRAFT",
  "created_at": "2023-11-07T05:31:56Z",
  "object": "tier_structure",
  "point_earned": {
    "period": {
      "value": 2,
      "unit": "HOUR"
    },
    "type": "IMMEDIATELY"
  },
  "expiration": {
    "type": "NO_EXPIRATION",
    "rolling_expiration": {
      "period": {
        "value": 2,
        "unit": "DAY"
      }
    },
    "calendar_expiration": {
      "calendar_dates": [
        {
          "day": 16,
          "month": 6
        }
      ]
    },
    "sliding_expiration": {
      "earning_activity": true,
      "spending_activity": true,
      "custom_activity": true,
      "period": {
        "value": 2,
        "unit": "DAY"
      },
      "custom_activity_types": [
        "<string>"
      ]
    }
  },
  "downgrade": {
    "type": "MULTI_LEVEL",
    "grace_period": {
      "value": 2,
      "unit": "DAY",
      "round_up": true
    }
  },
  "updated_at": "2023-11-07T05:31:56Z"
}