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

{
  "data": [
    {
      "id": "<string>",
      "tier_structure_id": "<string>",
      "name": "<string>",
      "downgrade": {
        "type": "INHERIT"
      },
      "metadata": {},
      "created_at": "2023-11-07T05:31:56Z",
      "object": "tier",
      "qualification_rules": {
        "type": "POINTS",
        "min_value": 1,
        "max_value": 1,
        "segment": {
          "id": "<string>"
        }
      },
      "updated_at": "2023-11-07T05:31:56Z"
    }
  ],
  "object": "list",
  "cursor": {
    "next": "<string>",
    "expires_at": "2023-11-07T05:31:56Z"
  }
}