curl --request PATCH \
  --url https://api.hubapi.com/crm-object-schemas/v3/schemas/{objectType} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "primaryDisplayProperty": "my_object_property",
  "requiredProperties": [
    "my_object_property"
  ],
  "searchableProperties": [
    "my_object_property"
  ]
}
'

import requests

url = "https://api.hubapi.com/crm-object-schemas/v3/schemas/{objectType}"

payload = {
    "primaryDisplayProperty": "my_object_property",
    "requiredProperties": ["my_object_property"],
    "searchableProperties": ["my_object_property"]
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'PATCH',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    primaryDisplayProperty: 'my_object_property',
    requiredProperties: ['my_object_property'],
    searchableProperties: ['my_object_property']
  })
};

fetch('https://api.hubapi.com/crm-object-schemas/v3/schemas/{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-object-schemas/v3/schemas/{objectType}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PATCH",
  CURLOPT_POSTFIELDS => json_encode([
    'primaryDisplayProperty' => 'my_object_property',
    'requiredProperties' => [
        'my_object_property'
    ],
    'searchableProperties' => [
        'my_object_property'
    ]
  ]),
  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-object-schemas/v3/schemas/{objectType}"

	payload := strings.NewReader("{\n  \"primaryDisplayProperty\": \"my_object_property\",\n  \"requiredProperties\": [\n    \"my_object_property\"\n  ],\n  \"searchableProperties\": [\n    \"my_object_property\"\n  ]\n}")

	req, _ := http.NewRequest("PATCH", 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.patch("https://api.hubapi.com/crm-object-schemas/v3/schemas/{objectType}")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"primaryDisplayProperty\": \"my_object_property\",\n  \"requiredProperties\": [\n    \"my_object_property\"\n  ],\n  \"searchableProperties\": [\n    \"my_object_property\"\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

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

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

request = Net::HTTP::Patch.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"primaryDisplayProperty\": \"my_object_property\",\n  \"requiredProperties\": [\n    \"my_object_property\"\n  ],\n  \"searchableProperties\": [\n    \"my_object_property\"\n  ]\n}"

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

{
  "createdAt": "2020-02-20T18:07:11.390Z",
  "id": "123456",
  "labels": {
    "plural": "My objects",
    "singular": "My object"
  },
  "metaType": "PORTAL_SPECIFIC",
  "name": "my_object",
  "portalId": 12345678,
  "primaryDisplayProperty": "my_object_property",
  "requiredProperties": [
    "my_object_property"
  ],
  "searchableProperties": [
    "my_object_property"
  ],
  "updatedAt": "2020-02-21T14:13:28.818002Z"
}

{
  "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"
  }
}