curl --request PUT \
  --url https://{cluster}.voucherify.io/v1/promotions/{campaignId}/stacks/{stackId} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'X-App-Id: <api-key>' \
  --header 'X-App-Token: <api-key>' \
  --data '{
  "name": "Fifth Stack Modified",
  "tiers": {
    "ids": [
      "promo_aaAF8mVAzA0PF1igia2OC63d",
      "promo_t9zdL6XMFk7B8fQ23zxELtdE"
    ],
    "hierarchy_mode": "MANUAL"
  }
}'

{
  "id": "stack_q2AmzFvOMCmg4Wdu5bDBlME6",
  "name": "Fifth Stack Modified",
  "created_at": "2022-09-23T07:44:53.888Z",
  "updated_at": "2022-09-23T07:59:44.172Z",
  "campaign_id": "camp_99HUWI53bVyLzPN1Fg5TBLWX",
  "object": "promotion_stack",
  "tiers": {
    "ids": [
      "promo_aaAF8mVAzA0PF1igia2OC63d",
      "promo_t9zdL6XMFk7B8fQ23zxELtdE"
    ],
    "hierarchy_mode": "MANUAL"
  }
}