curl --request POST \
  --url https://api.sonderplan.com/v2/custom-field \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "Booking Type",
  "type": "select",
  "module": "booking",
  "description": "Select the type of booking",
  "options": [
    {
      "id": "4934",
      "name": "Video Editing",
      "order": "2"
    }
  ],
  "order": 3,
  "required": true,
  "update_key": "2_1_8942"
}
'

import requests

url = "https://api.sonderplan.com/v2/custom-field"

payload = {
    "name": "Booking Type",
    "type": "select",
    "module": "booking",
    "description": "Select the type of booking",
    "options": [
        {
            "id": "4934",
            "name": "Video Editing",
            "order": "2"
        }
    ],
    "order": 3,
    "required": True,
    "update_key": "2_1_8942"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    name: 'Booking Type',
    type: 'select',
    module: 'booking',
    description: 'Select the type of booking',
    options: [{id: '4934', name: 'Video Editing', order: '2'}],
    order: 3,
    required: true,
    update_key: '2_1_8942'
  })
};

fetch('https://api.sonderplan.com/v2/custom-field', 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.sonderplan.com/v2/custom-field",
  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([
    'name' => 'Booking Type',
    'type' => 'select',
    'module' => 'booking',
    'description' => 'Select the type of booking',
    'options' => [
        [
                'id' => '4934',
                'name' => 'Video Editing',
                'order' => '2'
        ]
    ],
    'order' => 3,
    'required' => true,
    'update_key' => '2_1_8942'
  ]),
  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://api.sonderplan.com/v2/custom-field"

	payload := strings.NewReader("{\n  \"name\": \"Booking Type\",\n  \"type\": \"select\",\n  \"module\": \"booking\",\n  \"description\": \"Select the type of booking\",\n  \"options\": [\n    {\n      \"id\": \"4934\",\n      \"name\": \"Video Editing\",\n      \"order\": \"2\"\n    }\n  ],\n  \"order\": 3,\n  \"required\": true,\n  \"update_key\": \"2_1_8942\"\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://api.sonderplan.com/v2/custom-field")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"name\": \"Booking Type\",\n  \"type\": \"select\",\n  \"module\": \"booking\",\n  \"description\": \"Select the type of booking\",\n  \"options\": [\n    {\n      \"id\": \"4934\",\n      \"name\": \"Video Editing\",\n      \"order\": \"2\"\n    }\n  ],\n  \"order\": 3,\n  \"required\": true,\n  \"update_key\": \"2_1_8942\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.sonderplan.com/v2/custom-field")

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  \"name\": \"Booking Type\",\n  \"type\": \"select\",\n  \"module\": \"booking\",\n  \"description\": \"Select the type of booking\",\n  \"options\": [\n    {\n      \"id\": \"4934\",\n      \"name\": \"Video Editing\",\n      \"order\": \"2\"\n    }\n  ],\n  \"order\": 3,\n  \"required\": true,\n  \"update_key\": \"2_1_8942\"\n}"

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

{
  "success": {
    "id": 1
  }
}

{
  "error": {
    "code": "404",
    "message": "Requested resource was not found"
  }
}