curl --request PATCH \
  --url https://api.monaco.com/v1/contacts/{contact_id} \
  --header 'Content-Type: application/json' \
  --data '
{
  "first_name": "Jane",
  "last_name": "Smith",
  "email": "jane@acme.com",
  "title": "VP of Engineering",
  "phone_number": "+1-555-123-4567",
  "linkedin_url": "https://linkedin.com/in/janesmith",
  "location": "San Francisco, CA",
  "notes": "Met at SaaStr 2025",
  "do_not_contact": true,
  "tags": [
    "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  ]
}
'

import requests

url = "https://api.monaco.com/v1/contacts/{contact_id}"

payload = {
    "first_name": "Jane",
    "last_name": "Smith",
    "email": "jane@acme.com",
    "title": "VP of Engineering",
    "phone_number": "+1-555-123-4567",
    "linkedin_url": "https://linkedin.com/in/janesmith",
    "location": "San Francisco, CA",
    "notes": "Met at SaaStr 2025",
    "do_not_contact": True,
    "tags": ["3c90c3cc-0d44-4b50-8888-8dd25736052a"]
}
headers = {"Content-Type": "application/json"}

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

print(response.text)

const options = {
  method: 'PATCH',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    first_name: 'Jane',
    last_name: 'Smith',
    email: 'jane@acme.com',
    title: 'VP of Engineering',
    phone_number: '+1-555-123-4567',
    linkedin_url: 'https://linkedin.com/in/janesmith',
    location: 'San Francisco, CA',
    notes: 'Met at SaaStr 2025',
    do_not_contact: true,
    tags: ['3c90c3cc-0d44-4b50-8888-8dd25736052a']
  })
};

fetch('https://api.monaco.com/v1/contacts/{contact_id}', 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.monaco.com/v1/contacts/{contact_id}",
  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([
    'first_name' => 'Jane',
    'last_name' => 'Smith',
    'email' => 'jane@acme.com',
    'title' => 'VP of Engineering',
    'phone_number' => '+1-555-123-4567',
    'linkedin_url' => 'https://linkedin.com/in/janesmith',
    'location' => 'San Francisco, CA',
    'notes' => 'Met at SaaStr 2025',
    'do_not_contact' => true,
    'tags' => [
        '3c90c3cc-0d44-4b50-8888-8dd25736052a'
    ]
  ]),
  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.monaco.com/v1/contacts/{contact_id}"

	payload := strings.NewReader("{\n  \"first_name\": \"Jane\",\n  \"last_name\": \"Smith\",\n  \"email\": \"jane@acme.com\",\n  \"title\": \"VP of Engineering\",\n  \"phone_number\": \"+1-555-123-4567\",\n  \"linkedin_url\": \"https://linkedin.com/in/janesmith\",\n  \"location\": \"San Francisco, CA\",\n  \"notes\": \"Met at SaaStr 2025\",\n  \"do_not_contact\": true,\n  \"tags\": [\n    \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n  ]\n}")

	req, _ := http.NewRequest("PATCH", 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.patch("https://api.monaco.com/v1/contacts/{contact_id}")
  .header("Content-Type", "application/json")
  .body("{\n  \"first_name\": \"Jane\",\n  \"last_name\": \"Smith\",\n  \"email\": \"jane@acme.com\",\n  \"title\": \"VP of Engineering\",\n  \"phone_number\": \"+1-555-123-4567\",\n  \"linkedin_url\": \"https://linkedin.com/in/janesmith\",\n  \"location\": \"San Francisco, CA\",\n  \"notes\": \"Met at SaaStr 2025\",\n  \"do_not_contact\": true,\n  \"tags\": [\n    \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.monaco.com/v1/contacts/{contact_id}")

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

request = Net::HTTP::Patch.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"first_name\": \"Jane\",\n  \"last_name\": \"Smith\",\n  \"email\": \"jane@acme.com\",\n  \"title\": \"VP of Engineering\",\n  \"phone_number\": \"+1-555-123-4567\",\n  \"linkedin_url\": \"https://linkedin.com/in/janesmith\",\n  \"location\": \"San Francisco, CA\",\n  \"notes\": \"Met at SaaStr 2025\",\n  \"do_not_contact\": true,\n  \"tags\": [\n    \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n  ]\n}"

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

{
  "data": {
    "id": "con_abc123",
    "account_id": "acc_def456",
    "first_name": "Jane",
    "last_name": "Smith",
    "email": "jane@acme.com",
    "title": "VP of Engineering",
    "phone_number": "+1-555-123-4567",
    "linkedin_url": "https://linkedin.com/in/janesmith",
    "location": "San Francisco, CA",
    "source": "api",
    "do_not_contact": false,
    "notes": "Met at SaaStr 2025",
    "scoring": {
      "heat_score": "Hot"
    },
    "tags": [
      "Decision Maker"
    ],
    "created_at": "2025-06-15T10:30:00Z",
    "updated_at": "2026-04-21T12:00:00Z",
    "custom_field_1a2b3c4d-5e6f-4a7b-8c9d-0e1f2a3b4c5d": "economic_buyer"
  },
  "meta": {
    "timestamp": "2026-04-21T12:00:00Z"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>"
  }
}