curl --request GET \
  --url https://api.itmc.i.moneyforward.com/api/v1/organizations/{organizationId}/identity/fields/custom \
  --header 'Authorization: Bearer <token>'

import requests

url = "https://api.itmc.i.moneyforward.com/api/v1/organizations/{organizationId}/identity/fields/custom"

headers = {"Authorization": "Bearer <token>"}

response = requests.get(url, headers=headers)

print(response.text)

const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

fetch('https://api.itmc.i.moneyforward.com/api/v1/organizations/{organizationId}/identity/fields/custom', 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://api.itmc.i.moneyforward.com/api/v1/organizations/{organizationId}/identity/fields/custom",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>"
  ],
]);

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

curl_close($curl);

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

package main

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

func main() {

	url := "https://api.itmc.i.moneyforward.com/api/v1/organizations/{organizationId}/identity/fields/custom"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("Authorization", "Bearer <token>")

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

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

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.get("https://api.itmc.i.moneyforward.com/api/v1/organizations/{organizationId}/identity/fields/custom")
  .header("Authorization", "Bearer <token>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.itmc.i.moneyforward.com/api/v1/organizations/{organizationId}/identity/fields/custom")

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

request = Net::HTTP::Get.new(url)
request["Authorization"] = 'Bearer <token>'

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

{
  "items": [
    {
      "id": 1,
      "kind": "dropdown",
      "serviceSource": {
        "workspaceId": 1,
        "serviceFieldId": "smarthr_city"
      },
      "serviceDetails": {
        "id": 33,
        "name": "SmartHR",
        "uniqueName": "smarthr",
        "serviceTopUrl": "https://smarthr.jp/"
      },
      "configuration": {
        "values": [
          {
            "id": "option_1",
            "value": "Option 1",
            "group": "<string>",
            "label": {
              "ja": "こんにちは",
              "en": "Hello"
            }
          }
        ],
        "groups": [
          {
            "value": "phone",
            "label": {
              "ja": "こんにちは",
              "en": "Hello"
            }
          }
        ]
      },
      "required": true,
      "attributeCode": "custom_text_field",
      "attributeName": "Foo bar"
    }
  ],
  "availableSourceWorkspaces": [
    {
      "workspaceId": 123,
      "workspaceName": "<string>",
      "serviceId": 123,
      "serviceUniqueName": "<string>",
      "serviceName": "<string>"
    }
  ]
}