curl --request PATCH \
  --url https://api.hubapi.com/marketing/marketing-events/2026-09/{objectId} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "customProperties": [
    {
      "isEncrypted": true,
      "isLargeValue": true,
      "maskedSubstrings": {
        "substrings": [
          {
            "end": 123,
            "label": "<string>",
            "start": 123
          }
        ]
      },
      "name": "<string>",
      "persistenceTimestamp": 123,
      "requestId": "<string>",
      "selectedByUser": true,
      "selectedByUserTimestamp": 123,
      "sourceId": "<string>",
      "sourceLabel": "<string>",
      "sourceMetadata": "<string>",
      "sourceUpstreamDeployable": "<string>",
      "sourceVid": [
        123
      ],
      "timestamp": 123,
      "unit": "<string>",
      "updatedByUserId": 123,
      "useTimestampAsPersistenceTimestamp": true,
      "value": "<string>"
    }
  ],
  "endDateTime": "2023-11-07T05:31:56Z",
  "eventCancelled": true,
  "eventDescription": "<string>",
  "eventName": "<string>",
  "eventOrganizer": "<string>",
  "eventType": "<string>",
  "eventUrl": "<string>",
  "startDateTime": "2023-11-07T05:31:56Z"
}
'

import requests

url = "https://api.hubapi.com/marketing/marketing-events/2026-09/{objectId}"

payload = {
    "customProperties": [
        {
            "isEncrypted": True,
            "isLargeValue": True,
            "maskedSubstrings": { "substrings": [
                    {
                        "end": 123,
                        "label": "<string>",
                        "start": 123
                    }
                ] },
            "name": "<string>",
            "persistenceTimestamp": 123,
            "requestId": "<string>",
            "selectedByUser": True,
            "selectedByUserTimestamp": 123,
            "sourceId": "<string>",
            "sourceLabel": "<string>",
            "sourceMetadata": "<string>",
            "sourceUpstreamDeployable": "<string>",
            "sourceVid": [123],
            "timestamp": 123,
            "unit": "<string>",
            "updatedByUserId": 123,
            "useTimestampAsPersistenceTimestamp": True,
            "value": "<string>"
        }
    ],
    "endDateTime": "2023-11-07T05:31:56Z",
    "eventCancelled": True,
    "eventDescription": "<string>",
    "eventName": "<string>",
    "eventOrganizer": "<string>",
    "eventType": "<string>",
    "eventUrl": "<string>",
    "startDateTime": "2023-11-07T05:31:56Z"
}
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({
    customProperties: [
      {
        isEncrypted: true,
        isLargeValue: true,
        maskedSubstrings: {substrings: [{end: 123, label: '<string>', start: 123}]},
        name: '<string>',
        persistenceTimestamp: 123,
        requestId: '<string>',
        selectedByUser: true,
        selectedByUserTimestamp: 123,
        sourceId: '<string>',
        sourceLabel: '<string>',
        sourceMetadata: '<string>',
        sourceUpstreamDeployable: '<string>',
        sourceVid: [123],
        timestamp: 123,
        unit: '<string>',
        updatedByUserId: 123,
        useTimestampAsPersistenceTimestamp: true,
        value: '<string>'
      }
    ],
    endDateTime: '2023-11-07T05:31:56Z',
    eventCancelled: true,
    eventDescription: '<string>',
    eventName: '<string>',
    eventOrganizer: '<string>',
    eventType: '<string>',
    eventUrl: '<string>',
    startDateTime: '2023-11-07T05:31:56Z'
  })
};

fetch('https://api.hubapi.com/marketing/marketing-events/2026-09/{objectId}', 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/marketing/marketing-events/2026-09/{objectId}",
  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([
    'customProperties' => [
        [
                'isEncrypted' => true,
                'isLargeValue' => true,
                'maskedSubstrings' => [
                                'substrings' => [
                                                                [
                                                                                                                                'end' => 123,
                                                                                                                                'label' => '<string>',
                                                                                                                                'start' => 123
                                                                ]
                                ]
                ],
                'name' => '<string>',
                'persistenceTimestamp' => 123,
                'requestId' => '<string>',
                'selectedByUser' => true,
                'selectedByUserTimestamp' => 123,
                'sourceId' => '<string>',
                'sourceLabel' => '<string>',
                'sourceMetadata' => '<string>',
                'sourceUpstreamDeployable' => '<string>',
                'sourceVid' => [
                                123
                ],
                'timestamp' => 123,
                'unit' => '<string>',
                'updatedByUserId' => 123,
                'useTimestampAsPersistenceTimestamp' => true,
                'value' => '<string>'
        ]
    ],
    'endDateTime' => '2023-11-07T05:31:56Z',
    'eventCancelled' => true,
    'eventDescription' => '<string>',
    'eventName' => '<string>',
    'eventOrganizer' => '<string>',
    'eventType' => '<string>',
    'eventUrl' => '<string>',
    'startDateTime' => '2023-11-07T05:31:56Z'
  ]),
  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/marketing/marketing-events/2026-09/{objectId}"

	payload := strings.NewReader("{\n  \"customProperties\": [\n    {\n      \"isEncrypted\": true,\n      \"isLargeValue\": true,\n      \"maskedSubstrings\": {\n        \"substrings\": [\n          {\n            \"end\": 123,\n            \"label\": \"<string>\",\n            \"start\": 123\n          }\n        ]\n      },\n      \"name\": \"<string>\",\n      \"persistenceTimestamp\": 123,\n      \"requestId\": \"<string>\",\n      \"selectedByUser\": true,\n      \"selectedByUserTimestamp\": 123,\n      \"sourceId\": \"<string>\",\n      \"sourceLabel\": \"<string>\",\n      \"sourceMetadata\": \"<string>\",\n      \"sourceUpstreamDeployable\": \"<string>\",\n      \"sourceVid\": [\n        123\n      ],\n      \"timestamp\": 123,\n      \"unit\": \"<string>\",\n      \"updatedByUserId\": 123,\n      \"useTimestampAsPersistenceTimestamp\": true,\n      \"value\": \"<string>\"\n    }\n  ],\n  \"endDateTime\": \"2023-11-07T05:31:56Z\",\n  \"eventCancelled\": true,\n  \"eventDescription\": \"<string>\",\n  \"eventName\": \"<string>\",\n  \"eventOrganizer\": \"<string>\",\n  \"eventType\": \"<string>\",\n  \"eventUrl\": \"<string>\",\n  \"startDateTime\": \"2023-11-07T05:31:56Z\"\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/marketing/marketing-events/2026-09/{objectId}")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"customProperties\": [\n    {\n      \"isEncrypted\": true,\n      \"isLargeValue\": true,\n      \"maskedSubstrings\": {\n        \"substrings\": [\n          {\n            \"end\": 123,\n            \"label\": \"<string>\",\n            \"start\": 123\n          }\n        ]\n      },\n      \"name\": \"<string>\",\n      \"persistenceTimestamp\": 123,\n      \"requestId\": \"<string>\",\n      \"selectedByUser\": true,\n      \"selectedByUserTimestamp\": 123,\n      \"sourceId\": \"<string>\",\n      \"sourceLabel\": \"<string>\",\n      \"sourceMetadata\": \"<string>\",\n      \"sourceUpstreamDeployable\": \"<string>\",\n      \"sourceVid\": [\n        123\n      ],\n      \"timestamp\": 123,\n      \"unit\": \"<string>\",\n      \"updatedByUserId\": 123,\n      \"useTimestampAsPersistenceTimestamp\": true,\n      \"value\": \"<string>\"\n    }\n  ],\n  \"endDateTime\": \"2023-11-07T05:31:56Z\",\n  \"eventCancelled\": true,\n  \"eventDescription\": \"<string>\",\n  \"eventName\": \"<string>\",\n  \"eventOrganizer\": \"<string>\",\n  \"eventType\": \"<string>\",\n  \"eventUrl\": \"<string>\",\n  \"startDateTime\": \"2023-11-07T05:31:56Z\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.hubapi.com/marketing/marketing-events/2026-09/{objectId}")

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  \"customProperties\": [\n    {\n      \"isEncrypted\": true,\n      \"isLargeValue\": true,\n      \"maskedSubstrings\": {\n        \"substrings\": [\n          {\n            \"end\": 123,\n            \"label\": \"<string>\",\n            \"start\": 123\n          }\n        ]\n      },\n      \"name\": \"<string>\",\n      \"persistenceTimestamp\": 123,\n      \"requestId\": \"<string>\",\n      \"selectedByUser\": true,\n      \"selectedByUserTimestamp\": 123,\n      \"sourceId\": \"<string>\",\n      \"sourceLabel\": \"<string>\",\n      \"sourceMetadata\": \"<string>\",\n      \"sourceUpstreamDeployable\": \"<string>\",\n      \"sourceVid\": [\n        123\n      ],\n      \"timestamp\": 123,\n      \"unit\": \"<string>\",\n      \"updatedByUserId\": 123,\n      \"useTimestampAsPersistenceTimestamp\": true,\n      \"value\": \"<string>\"\n    }\n  ],\n  \"endDateTime\": \"2023-11-07T05:31:56Z\",\n  \"eventCancelled\": true,\n  \"eventDescription\": \"<string>\",\n  \"eventName\": \"<string>\",\n  \"eventOrganizer\": \"<string>\",\n  \"eventType\": \"<string>\",\n  \"eventUrl\": \"<string>\",\n  \"startDateTime\": \"2023-11-07T05:31:56Z\"\n}"

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

{
  "createdAt": "2023-11-07T05:31:56Z",
  "customProperties": [
    {
      "name": "<string>",
      "value": "<string>"
    }
  ],
  "eventName": "<string>",
  "objectId": "<string>",
  "updatedAt": "2023-11-07T05:31:56Z",
  "appInfo": {
    "id": "<string>",
    "name": "<string>"
  },
  "endDateTime": "2023-11-07T05:31:56Z",
  "eventCancelled": true,
  "eventCompleted": true,
  "eventDescription": "<string>",
  "eventOrganizer": "<string>",
  "eventType": "<string>",
  "eventUrl": "<string>",
  "startDateTime": "2023-11-07T05:31:56Z"
}

{
  "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"
  }
}