curl --request POST \
  --url https://app.example.com/v1/admin/relationships/custom-fields \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "id": "cfld_01h...",
  "key": "<string>",
  "label": "<string>",
  "dataType": "text"
}'

const response = await fetch("https://app.example.com/v1/admin/relationships/custom-fields", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "Authorization": "Bearer <token>"
  },
  body: JSON.stringify({
    "id": "cfld_01h...",
    "key": "<string>",
    "label": "<string>",
    "dataType": "text"
  }),
});

const data = await response.json();

import requests

response = requests.post(
    "https://app.example.com/v1/admin/relationships/custom-fields",
    headers={
        "Authorization": "Bearer <token>"
    },
    json={
        "id": "cfld_01h...",
        "key": "<string>",
        "label": "<string>",
        "dataType": "text"
    }
)

data = response.json()

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://{operatorDomain}/v1/admin/relationships/custom-fields",
  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([
    'id' => 'cfld_01h...',
    'key' => '<string>',
    'label' => '<string>',
    'dataType' => 'text'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "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://{operatorDomain}/v1/admin/relationships/custom-fields"

	payload := strings.NewReader("{\n  \"id\": \"cfld_01h...\",\n  \"key\": \"<string>\",\n  \"label\": \"<string>\",\n  \"dataType\": \"text\"\n}")

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

	req.Header.Add("Authorization", "Bearer <token>")
	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://{operatorDomain}/v1/admin/relationships/custom-fields")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"id\": \"cfld_01h...\",\n  \"key\": \"<string>\",\n  \"label\": \"<string>\",\n  \"dataType\": \"text\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://{operatorDomain}/v1/admin/relationships/custom-fields")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"id\": \"cfld_01h...\",\n  \"key\": \"<string>\",\n  \"label\": \"<string>\",\n  \"dataType\": \"text\"\n}"

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

{
  "id": "cfld_01h...",
  "key": "<string>",
  "label": "<string>",
  "dataType": "text"
}

{
  "error": "<string>",
  "code": "<string>",
  "requestId": "<string>",
  "details": {}
}

{
  "error": "<string>",
  "code": "<string>",
  "requestId": "<string>",
  "details": {}
}

{
  "error": "<string>",
  "code": "<string>",
  "requestId": "<string>",
  "details": {}
}

{
  "error": "<string>",
  "code": "<string>",
  "requestId": "<string>",
  "details": {}
}