curl --request POST \
  --url https://{host}/product-catalog/v1/HierarchyReferenceBook/Import \
  --header 'Content-Type: application/json' \
  --data '
[
  {
    "depthId": 0,
    "name": "Root",
    "externalDepth": -1
  },
  {
    "depthId": 1,
    "name": "Level 1",
    "externalDepth": 1
  },
  {
    "depthId": 2,
    "name": "Level 2",
    "externalDepth": 2
  },
  {
    "depthId": 3,
    "name": "Level 3",
    "externalDepth": 3
  },
  {
    "depthId": 4,
    "name": "Level 4",
    "externalDepth": 4
  },
  {
    "depthId": 5,
    "name": "Level 5",
    "externalDepth": 5
  }
]
'

import requests

url = "https://{host}/product-catalog/v1/HierarchyReferenceBook/Import"

payload = [
    {
        "depthId": 0,
        "name": "Root",
        "externalDepth": -1
    },
    {
        "depthId": 1,
        "name": "Level 1",
        "externalDepth": 1
    },
    {
        "depthId": 2,
        "name": "Level 2",
        "externalDepth": 2
    },
    {
        "depthId": 3,
        "name": "Level 3",
        "externalDepth": 3
    },
    {
        "depthId": 4,
        "name": "Level 4",
        "externalDepth": 4
    },
    {
        "depthId": 5,
        "name": "Level 5",
        "externalDepth": 5
    }
]
headers = {"Content-Type": "application/json"}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify([
    {depthId: 0, name: 'Root', externalDepth: -1},
    {depthId: 1, name: 'Level 1', externalDepth: 1},
    {depthId: 2, name: 'Level 2', externalDepth: 2},
    {depthId: 3, name: 'Level 3', externalDepth: 3},
    {depthId: 4, name: 'Level 4', externalDepth: 4},
    {depthId: 5, name: 'Level 5', externalDepth: 5}
  ])
};

fetch('https://{host}/product-catalog/v1/HierarchyReferenceBook/Import', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://{host}/product-catalog/v1/HierarchyReferenceBook/Import",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    [
        'depthId' => 0,
        'name' => 'Root',
        'externalDepth' => -1
    ],
    [
        'depthId' => 1,
        'name' => 'Level 1',
        'externalDepth' => 1
    ],
    [
        'depthId' => 2,
        'name' => 'Level 2',
        'externalDepth' => 2
    ],
    [
        'depthId' => 3,
        'name' => 'Level 3',
        'externalDepth' => 3
    ],
    [
        'depthId' => 4,
        'name' => 'Level 4',
        'externalDepth' => 4
    ],
    [
        'depthId' => 5,
        'name' => 'Level 5',
        'externalDepth' => 5
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://{host}/product-catalog/v1/HierarchyReferenceBook/Import"

	payload := strings.NewReader("[\n  {\n    \"depthId\": 0,\n    \"name\": \"Root\",\n    \"externalDepth\": -1\n  },\n  {\n    \"depthId\": 1,\n    \"name\": \"Level 1\",\n    \"externalDepth\": 1\n  },\n  {\n    \"depthId\": 2,\n    \"name\": \"Level 2\",\n    \"externalDepth\": 2\n  },\n  {\n    \"depthId\": 3,\n    \"name\": \"Level 3\",\n    \"externalDepth\": 3\n  },\n  {\n    \"depthId\": 4,\n    \"name\": \"Level 4\",\n    \"externalDepth\": 4\n  },\n  {\n    \"depthId\": 5,\n    \"name\": \"Level 5\",\n    \"externalDepth\": 5\n  }\n]")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://{host}/product-catalog/v1/HierarchyReferenceBook/Import")
  .header("Content-Type", "application/json")
  .body("[\n  {\n    \"depthId\": 0,\n    \"name\": \"Root\",\n    \"externalDepth\": -1\n  },\n  {\n    \"depthId\": 1,\n    \"name\": \"Level 1\",\n    \"externalDepth\": 1\n  },\n  {\n    \"depthId\": 2,\n    \"name\": \"Level 2\",\n    \"externalDepth\": 2\n  },\n  {\n    \"depthId\": 3,\n    \"name\": \"Level 3\",\n    \"externalDepth\": 3\n  },\n  {\n    \"depthId\": 4,\n    \"name\": \"Level 4\",\n    \"externalDepth\": 4\n  },\n  {\n    \"depthId\": 5,\n    \"name\": \"Level 5\",\n    \"externalDepth\": 5\n  }\n]")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://{host}/product-catalog/v1/HierarchyReferenceBook/Import")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "[\n  {\n    \"depthId\": 0,\n    \"name\": \"Root\",\n    \"externalDepth\": -1\n  },\n  {\n    \"depthId\": 1,\n    \"name\": \"Level 1\",\n    \"externalDepth\": 1\n  },\n  {\n    \"depthId\": 2,\n    \"name\": \"Level 2\",\n    \"externalDepth\": 2\n  },\n  {\n    \"depthId\": 3,\n    \"name\": \"Level 3\",\n    \"externalDepth\": 3\n  },\n  {\n    \"depthId\": 4,\n    \"name\": \"Level 4\",\n    \"externalDepth\": 4\n  },\n  {\n    \"depthId\": 5,\n    \"name\": \"Level 5\",\n    \"externalDepth\": 5\n  }\n]"

response = http.request(request)
puts response.read_body

{}

{
  "errors": [
    {
      "name": "<string>",
      "message": "<string>",
      "details": null
    }
  ]
}