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

{
  "object": "list",
  "data_ref": "data",
  "data": [
    {
      "id": "stack_SLuhQrAt3mXwHg776lYkzZO8",
      "name": "Stack 2",
      "created_at": "2022-11-03T10:18:58.356Z",
      "campaign_id": "camp_h8RyP6FV94F3Ev2odP24j5p1",
      "object": "promotion_stack",
      "tiers": {
        "ids": [
          "promo_Mfww2TuoeU23enqSmnz0f3rh",
          "promo_vU5IHaLKS7mmZ3ylABET6ikb",
          "promo_TeHA11JlfN29mUftDcpqIWWq",
          "promo_bhKBsIX3tO7yqmpTLCLLuaud"
        ],
        "hierarchy_mode": "MANUAL"
      }
    },
    {
      "id": "stack_twQWp1TyaxX5RlSqn061xGVy",
      "name": "First stack",
      "created_at": "2021-12-27T11:59:21.838Z",
      "updated_at": "2022-12-16T08:22:51.970Z",
      "campaign_id": "camp_HXsR22VUMC4hN4DR7eAhCalp",
      "object": "promotion_stack",
      "tiers": {
        "ids": [
          "promo_Vet0vCNyyo5pOddHfu2X3FCB",
          "promo_PoIyRVFA5c0Jk514xCpzKHga",
          "promo_Mwy9XpA0TLctSGriM5kum0qp"
        ],
        "hierarchy_mode": "MANUAL"
      }
    },
    {
      "id": "stack_vhCqN5PY7rmPw8yACRvHRZaz",
      "name": "Second stack",
      "created_at": "2021-12-27T11:55:47.431Z",
      "updated_at": "2022-12-16T08:22:52.221Z",
      "campaign_id": "camp_HXsR22VUMC4hN4DR7eAhCalp",
      "object": "promotion_stack",
      "tiers": {
        "ids": [
          "promo_Vet0vCNyyo5pOddHfu2X3FCB",
          "promo_PoIyRVFA5c0Jk514xCpzKHga",
          "promo_Mwy9XpA0TLctSGriM5kum0qp"
        ],
        "hierarchy_mode": "MANUAL"
      }
    },
    {
      "id": "stack_zwChew7GY1AnDZJQ6GVP2sdT",
      "name": "Third stack",
      "created_at": "2021-12-27T11:54:26.283Z",
      "updated_at": "2022-12-16T08:22:52.483Z",
      "campaign_id": "camp_HXsR22VUMC4hN4DR7eAhCalp",
      "object": "promotion_stack",
      "tiers": {
        "ids": [
          "promo_Vet0vCNyyo5pOddHfu2X3FCB",
          "promo_Mwy9XpA0TLctSGriM5kum0qp",
          "promo_PoIyRVFA5c0Jk514xCpzKHga"
        ],
        "hierarchy_mode": "MANUAL"
      }
    },
    {
      "id": "stack_NS5hEUznL9XPa89rbrOZYMey",
      "name": "Fourth stack",
      "created_at": "2021-12-27T11:48:43.982Z",
      "campaign_id": "camp_HXsR22VUMC4hN4DR7eAhCalp",
      "object": "promotion_stack",
      "tiers": {
        "ids": [
          "promo_Vet0vCNyyo5pOddHfu2X3FCB",
          "promo_Mwy9XpA0TLctSGriM5kum0qp",
          "promo_PoIyRVFA5c0Jk514xCpzKHga"
        ],
        "hierarchy_mode": "MANUAL"
      }
    },
    {
      "id": "stack_Rz0NvFtCZOObS3J5R68KET17",
      "name": "Third stack",
      "created_at": "2021-12-27T11:40:57.426Z",
      "campaign_id": "camp_HXsR22VUMC4hN4DR7eAhCalp",
      "object": "promotion_stack",
      "tiers": {
        "ids": [
          "promo_Vet0vCNyyo5pOddHfu2X3FCB",
          "promo_PoIyRVFA5c0Jk514xCpzKHga"
        ],
        "hierarchy_mode": "MANUAL"
      }
    },
    {
      "id": "stack_e8pH0nIuANmYRPE0x8hwDrpm",
      "name": "Second stack",
      "created_at": "2021-12-27T08:43:13.875Z",
      "campaign_id": "camp_HXsR22VUMC4hN4DR7eAhCalp",
      "object": "promotion_stack",
      "tiers": {
        "ids": [
          "promo_Mwy9XpA0TLctSGriM5kum0qp",
          "promo_PoIyRVFA5c0Jk514xCpzKHga"
        ],
        "hierarchy_mode": "MANUAL"
      }
    },
    {
      "id": "stack_3Q4EJpZqg3DI5IRwgBYfsb37",
      "name": "First stack",
      "created_at": "2021-12-27T08:43:13.498Z",
      "campaign_id": "camp_HXsR22VUMC4hN4DR7eAhCalp",
      "object": "promotion_stack",
      "tiers": {
        "ids": [
          "promo_Vet0vCNyyo5pOddHfu2X3FCB",
          "promo_PoIyRVFA5c0Jk514xCpzKHga"
        ],
        "hierarchy_mode": "MANUAL"
      }
    },
    {
      "id": "stack_KxSD0GahLUg9ULB6TseGfUHJ",
      "name": "Stack 1",
      "created_at": "2021-12-23T12:28:38.881Z",
      "campaign_id": "camp_h8RyP6FV94F3Ev2odP24j5p1",
      "object": "promotion_stack",
      "tiers": {
        "ids": [
          "promo_NMex647s5UushvbBUJmYT2Fc",
          "promo_4TqHr24boFISDrcOHSlfAxwm"
        ],
        "hierarchy_mode": "MANUAL"
      }
    }
  ],
  "total": 9
}