curl --request POST \
  --url https://api.birdeye.com/resources/v1/business/public/custom-fields/create \
  --header 'Content-Type: application/json' \
  --data '
{
  "defaultValue": "Green",
  "dropDownOptions": [
    "Blue",
    "Green",
    "Red"
  ],
  "fieldDescription": "This custom field contains list of colours",
  "fieldName": "colours",
  "filterable": "false",
  "type": "DROPDOWN_MULTI"
}
'

import requests

url = "https://api.birdeye.com/resources/v1/business/public/custom-fields/create"

payload = {
    "defaultValue": "Green",
    "dropDownOptions": ["Blue", "Green", "Red"],
    "fieldDescription": "This custom field contains list of colours",
    "fieldName": "colours",
    "filterable": "false",
    "type": "DROPDOWN_MULTI"
}
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({
    defaultValue: 'Green',
    dropDownOptions: ['Blue', 'Green', 'Red'],
    fieldDescription: 'This custom field contains list of colours',
    fieldName: 'colours',
    filterable: 'false',
    type: 'DROPDOWN_MULTI'
  })
};

fetch('https://api.birdeye.com/resources/v1/business/public/custom-fields/create', 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.birdeye.com/resources/v1/business/public/custom-fields/create",
  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([
    'defaultValue' => 'Green',
    'dropDownOptions' => [
        'Blue',
        'Green',
        'Red'
    ],
    'fieldDescription' => 'This custom field contains list of colours',
    'fieldName' => 'colours',
    'filterable' => 'false',
    'type' => 'DROPDOWN_MULTI'
  ]),
  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://api.birdeye.com/resources/v1/business/public/custom-fields/create"

	payload := strings.NewReader("{\n  \"defaultValue\": \"Green\",\n  \"dropDownOptions\": [\n    \"Blue\",\n    \"Green\",\n    \"Red\"\n  ],\n  \"fieldDescription\": \"This custom field contains list of colours\",\n  \"fieldName\": \"colours\",\n  \"filterable\": \"false\",\n  \"type\": \"DROPDOWN_MULTI\"\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://api.birdeye.com/resources/v1/business/public/custom-fields/create")
  .header("Content-Type", "application/json")
  .body("{\n  \"defaultValue\": \"Green\",\n  \"dropDownOptions\": [\n    \"Blue\",\n    \"Green\",\n    \"Red\"\n  ],\n  \"fieldDescription\": \"This custom field contains list of colours\",\n  \"fieldName\": \"colours\",\n  \"filterable\": \"false\",\n  \"type\": \"DROPDOWN_MULTI\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.birdeye.com/resources/v1/business/public/custom-fields/create")

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  \"defaultValue\": \"Green\",\n  \"dropDownOptions\": [\n    \"Blue\",\n    \"Green\",\n    \"Red\"\n  ],\n  \"fieldDescription\": \"This custom field contains list of colours\",\n  \"fieldName\": \"colours\",\n  \"filterable\": \"false\",\n  \"type\": \"DROPDOWN_MULTI\"\n}"

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

{
  "code": 5040,
  "message": "Max limit reached for custom fields."
}