curl --request POST \
  --url https://{cluster}.voucherify.io/v1/promotions/tiers/{tierId}/validation \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'X-App-Id: <api-key>' \
  --header 'X-App-Token: <api-key>' \
  --data '{
  "customer": {
    "source_id": "test-user@email.io"
  },
  "order": {
    "id": "ord_71uW6qnB5CFZlLHCeCNC4qtS"
  }
}'

{
  "valid": true,
  "applicable_to": {
    "data": [],
    "total": 0,
    "data_ref": "data",
    "object": "list"
  },
  "inapplicable_to": {
    "data": [],
    "total": 0,
    "data_ref": "data",
    "object": "list"
  },
  "tracking_id": "track_OWyBVb1mg1qnieLLNygh19A0Ia7FsJck",
  "order": {
    "id": "ord_71uW6qnB5CFZlLHCeCNC4qtS",
    "source_id": null,
    "created_at": "2022-11-17T12:17:55.096Z",
    "updated_at": null,
    "status": "CREATED",
    "amount": 9918200,
    "initial_amount": 468200,
    "items_discount_amount": 9450000,
    "total_discount_amount": 9450000,
    "total_amount": 468200,
    "items_applied_discount_amount": 9450000,
    "total_applied_discount_amount": 9450000,
    "items": [
      {
        "object": "order_item",
        "source_id": "webinar_BF_sweater_pink_sweater",
        "related_object": "product",
        "quantity": 1,
        "amount": 6500,
        "price": 6500,
        "subtotal_amount": 6500
      },
      {
        "object": "order_item",
        "source_id": "webinar_BF_pants_navy_sweat_pants",
        "related_object": "product",
        "quantity": 1,
        "amount": 6000,
        "price": 6000,
        "subtotal_amount": 6000
      },
      {
        "object": "order_item",
        "source_id": "5h1pp1ng",
        "related_object": "product",
        "quantity": 1,
        "amount": 2000,
        "price": 2000,
        "subtotal_amount": 2000,
        "product": {
          "id": "prod_5h1pp1ng",
          "source_id": "5h1pp1ng",
          "name": "Shipping"
        }
      },
      {
        "object": "order_item",
        "source_id": "webinar_BF_pants_gray_sweat_pants",
        "related_object": "product",
        "quantity": 2,
        "amount": 10000,
        "price": 5000,
        "subtotal_amount": 10000
      },
      {
        "object": "order_item",
        "source_id": "webinar_BF_sweater_pearl",
        "related_object": "product",
        "quantity": 2,
        "amount": 22000,
        "price": 11000,
        "subtotal_amount": 22000
      },
      {
        "object": "order_item",
        "product_id": "prod_0b7d7dfb05cbe5c616",
        "sku_id": "sku_0b7d7dfb090be5c619",
        "quantity": 1,
        "amount": 1700,
        "price": 1700,
        "subtotal_amount": 1700,
        "product": {
          "id": "prod_0b7d7dfb05cbe5c616",
          "source_id": "Books",
          "name": "Comic Books1",
          "price": 2100
        },
        "sku": {
          "id": "sku_0b7d7dfb090be5c619",
          "source_id": "ComicBook_1",
          "sku": "Comics1",
          "price": 1700
        }
      },
      {
        "object": "order_item",
        "product_id": "prod_0bae32322150fd0546",
        "quantity": 2,
        "amount": 420000,
        "price": 210000,
        "subtotal_amount": 420000,
        "product": {
          "id": "prod_0bae32322150fd0546",
          "name": "Samsung Phone",
          "price": 210000
        }
      },
      {
        "object": "order_item",
        "product_id": "prod_0bae2dc5a090fd0184",
        "sku_id": "sku_0bae3b28f610fd0da1",
        "quantity": 45,
        "discount_quantity": 45,
        "initial_quantity": 0,
        "amount": 9450000,
        "discount_amount": 9450000,
        "initial_amount": 0,
        "applied_discount_amount": 9450000,
        "price": 210000,
        "subtotal_amount": 0,
        "product": {
          "id": "prod_0bae2dc5a090fd0184",
          "source_id": "first_product",
          "name": "Samsung Phone 1",
          "price": 220000
        },
        "sku": {
          "id": "sku_0bae3b28f610fd0da1",
          "source_id": "first_product_sku_1",
          "sku": "Samsung phone 256GB",
          "price": 210000
        }
      }
    ],
    "metadata": {},
    "customer_id": null,
    "referrer_id": null,
    "object": "order"
  },
  "id": "promo_ZWkx6R0I1Ts3N9HL4kfTdxOm",
  "name": "Add new SKU",
  "discount": {
    "type": "UNIT",
    "effect": "ADD_NEW_ITEMS",
    "unit_off": 45,
    "unit_type": "sku_0bae3b28f610fd0da1",
    "sku": {
      "id": "sku_0bae3b28f610fd0da1",
      "source_id": "first_product_sku_1",
      "sku": "Samsung phone 256GB"
    },
    "product": {
      "id": "prod_0bae2dc5a090fd0184",
      "source_id": "first_product",
      "name": "Samsung Phone 1"
    }
  },
  "campaign": {
    "id": "camp_40LC42P5NFbkkD4RWoJ4btks",
    "start_date": null,
    "expiration_date": null,
    "active": true,
    "object": "campaign"
  },
  "hierarchy": 4,
  "discount_amount": 9450000,
  "applied_discount_amount": 9450000,
  "metadata": {},
  "object": "promotion_tier"
}