curl --request POST \
  --url https://api.hubapi.com/crm/v3/properties/{objectType} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "displayOrder": 2,
  "fieldType": "select",
  "formField": true,
  "groupName": "contactinformation",
  "hasUniqueValue": false,
  "hidden": false,
  "label": "My Contact Property",
  "name": "my_contact_property",
  "options": [
    {
      "description": "Choice number one",
      "displayOrder": 1,
      "hidden": false,
      "label": "Option A",
      "value": "A"
    },
    {
      "description": "Choice number two",
      "displayOrder": 2,
      "hidden": false,
      "label": "Option B",
      "value": "B"
    }
  ],
  "type": "enumeration"
}
'

import requests

url = "https://api.hubapi.com/crm/v3/properties/{objectType}"

payload = {
    "displayOrder": 2,
    "fieldType": "select",
    "formField": True,
    "groupName": "contactinformation",
    "hasUniqueValue": False,
    "hidden": False,
    "label": "My Contact Property",
    "name": "my_contact_property",
    "options": [
        {
            "description": "Choice number one",
            "displayOrder": 1,
            "hidden": False,
            "label": "Option A",
            "value": "A"
        },
        {
            "description": "Choice number two",
            "displayOrder": 2,
            "hidden": False,
            "label": "Option B",
            "value": "B"
        }
    ],
    "type": "enumeration"
}
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({
    displayOrder: 2,
    fieldType: 'select',
    formField: true,
    groupName: 'contactinformation',
    hasUniqueValue: false,
    hidden: false,
    label: 'My Contact Property',
    name: 'my_contact_property',
    options: [
      {
        description: 'Choice number one',
        displayOrder: 1,
        hidden: false,
        label: 'Option A',
        value: 'A'
      },
      {
        description: 'Choice number two',
        displayOrder: 2,
        hidden: false,
        label: 'Option B',
        value: 'B'
      }
    ],
    type: 'enumeration'
  })
};

fetch('https://api.hubapi.com/crm/v3/properties/{objectType}', 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.hubapi.com/crm/v3/properties/{objectType}",
  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([
    'displayOrder' => 2,
    'fieldType' => 'select',
    'formField' => true,
    'groupName' => 'contactinformation',
    'hasUniqueValue' => false,
    'hidden' => false,
    'label' => 'My Contact Property',
    'name' => 'my_contact_property',
    'options' => [
        [
                'description' => 'Choice number one',
                'displayOrder' => 1,
                'hidden' => false,
                'label' => 'Option A',
                'value' => 'A'
        ],
        [
                'description' => 'Choice number two',
                'displayOrder' => 2,
                'hidden' => false,
                'label' => 'Option B',
                'value' => 'B'
        ]
    ],
    'type' => 'enumeration'
  ]),
  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.hubapi.com/crm/v3/properties/{objectType}"

	payload := strings.NewReader("{\n  \"displayOrder\": 2,\n  \"fieldType\": \"select\",\n  \"formField\": true,\n  \"groupName\": \"contactinformation\",\n  \"hasUniqueValue\": false,\n  \"hidden\": false,\n  \"label\": \"My Contact Property\",\n  \"name\": \"my_contact_property\",\n  \"options\": [\n    {\n      \"description\": \"Choice number one\",\n      \"displayOrder\": 1,\n      \"hidden\": false,\n      \"label\": \"Option A\",\n      \"value\": \"A\"\n    },\n    {\n      \"description\": \"Choice number two\",\n      \"displayOrder\": 2,\n      \"hidden\": false,\n      \"label\": \"Option B\",\n      \"value\": \"B\"\n    }\n  ],\n  \"type\": \"enumeration\"\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.hubapi.com/crm/v3/properties/{objectType}")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"displayOrder\": 2,\n  \"fieldType\": \"select\",\n  \"formField\": true,\n  \"groupName\": \"contactinformation\",\n  \"hasUniqueValue\": false,\n  \"hidden\": false,\n  \"label\": \"My Contact Property\",\n  \"name\": \"my_contact_property\",\n  \"options\": [\n    {\n      \"description\": \"Choice number one\",\n      \"displayOrder\": 1,\n      \"hidden\": false,\n      \"label\": \"Option A\",\n      \"value\": \"A\"\n    },\n    {\n      \"description\": \"Choice number two\",\n      \"displayOrder\": 2,\n      \"hidden\": false,\n      \"label\": \"Option B\",\n      \"value\": \"B\"\n    }\n  ],\n  \"type\": \"enumeration\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.hubapi.com/crm/v3/properties/{objectType}")

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  \"displayOrder\": 2,\n  \"fieldType\": \"select\",\n  \"formField\": true,\n  \"groupName\": \"contactinformation\",\n  \"hasUniqueValue\": false,\n  \"hidden\": false,\n  \"label\": \"My Contact Property\",\n  \"name\": \"my_contact_property\",\n  \"options\": [\n    {\n      \"description\": \"Choice number one\",\n      \"displayOrder\": 1,\n      \"hidden\": false,\n      \"label\": \"Option A\",\n      \"value\": \"A\"\n    },\n    {\n      \"description\": \"Choice number two\",\n      \"displayOrder\": 2,\n      \"hidden\": false,\n      \"label\": \"Option B\",\n      \"value\": \"B\"\n    }\n  ],\n  \"type\": \"enumeration\"\n}"

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

{
  "displayOrder": 2,
  "fieldType": "select",
  "formField": true,
  "groupName": "contactinformation",
  "hasUniqueValue": false,
  "hidden": false,
  "label": "My Contact Property",
  "modificationMetadata": {
    "archivable": true,
    "readOnlyDefinition": false,
    "readOnlyOptions": false,
    "readOnlyValue": false
  },
  "name": "my_contact_property",
  "options": [
    {
      "description": "Choice number one",
      "displayOrder": 1,
      "hidden": false,
      "label": "Option A",
      "value": "A"
    },
    {
      "description": "Choice number two",
      "displayOrder": 2,
      "hidden": false,
      "label": "Option B",
      "value": "B"
    }
  ],
  "type": "enumeration"
}

{
  "message": "Invalid input (details will vary based on the error)",
  "correlationId": "aeb5f871-7f07-4993-9211-075dc63e7cbf",
  "category": "VALIDATION_ERROR",
  "links": {
    "knowledge-base": "https://www.hubspot.com/products/service/knowledge-base"
  }
}