curl --request GET \
  --url https://api.hubapi.com/crm-object-schemas/v3/schemas \
  --header 'Authorization: Bearer <token>'

import requests

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

headers = {"Authorization": "Bearer <token>"}

response = requests.get(url, headers=headers)

print(response.text)

const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

fetch('https://api.hubapi.com/crm-object-schemas/v3/schemas', 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",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

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

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("Authorization", "Bearer <token>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.get("https://api.hubapi.com/crm-object-schemas/v3/schemas")
  .header("Authorization", "Bearer <token>")
  .asString();

require 'uri'
require 'net/http'

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

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

request = Net::HTTP::Get.new(url)
request["Authorization"] = 'Bearer <token>'

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

{
  "results": [
    {
      "associations": [
        {
          "fromObjectTypeId": "2-123456",
          "id": "123",
          "name": "my_object_to_contact",
          "toObjectTypeId": "0-1"
        }
      ],
      "createdAt": "2020-02-20T18:07:11.390Z",
      "fullyQualifiedName": "p7878787_my_object\"",
      "id": "123456",
      "labels": {
        "plural": "My objects",
        "singular": "My object"
      },
      "metaType": "PORTAL_SPECIFIC",
      "name": "my_object",
      "primaryDisplayProperty": "my_object_property",
      "properties": [
        {
          "archived": false,
          "calculated": false,
          "createdAt": "2020-02-20T18:07:11.802Z",
          "displayOrder": -1,
          "externalOptions": false,
          "fieldType": "text",
          "groupName": "my_object_information",
          "hasUniqueValue": false,
          "label": "My object property",
          "name": "my_object_property",
          "type": "string",
          "updatedAt": "2020-02-20T18:07:11.802Z"
        }
      ],
      "requiredProperties": [
        "my_object_property"
      ],
      "searchableProperties": [
        "my_object_property"
      ],
      "updatedAt": "2020-02-20T18:09:07.555Z"
    }
  ]
}

{
  "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"
  }
}