curl --request PATCH \
  --url https://api.jtl-cloud.com/erp/customers/{customerId}/contacts/{customerContactId} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'x-tenant-id: <x-tenant-id>' \
  --data '
{
  "Department": "Management",
  "Honorific": "Herr",
  "FirstName": "John",
  "LastName": "Smith",
  "PhoneNumber": "01234 / 123456-0",
  "MobilePhoneNumber": "0162 / 1234567",
  "EmailAddress": "john.smith@somemail.com",
  "Fax": "01234 / 123456-13"
}
'

import requests

url = "https://api.jtl-cloud.com/erp/customers/{customerId}/contacts/{customerContactId}"

payload = {
    "Department": "Management",
    "Honorific": "Herr",
    "FirstName": "John",
    "LastName": "Smith",
    "PhoneNumber": "01234 / 123456-0",
    "MobilePhoneNumber": "0162 / 1234567",
    "EmailAddress": "john.smith@somemail.com",
    "Fax": "01234 / 123456-13"
}
headers = {
    "x-tenant-id": "<x-tenant-id>",
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'PATCH',
  headers: {
    'x-tenant-id': '<x-tenant-id>',
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    Department: 'Management',
    Honorific: 'Herr',
    FirstName: 'John',
    LastName: 'Smith',
    PhoneNumber: '01234 / 123456-0',
    MobilePhoneNumber: '0162 / 1234567',
    EmailAddress: 'john.smith@somemail.com',
    Fax: '01234 / 123456-13'
  })
};

fetch('https://api.jtl-cloud.com/erp/customers/{customerId}/contacts/{customerContactId}', 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.jtl-cloud.com/erp/customers/{customerId}/contacts/{customerContactId}",
  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([
    'Department' => 'Management',
    'Honorific' => 'Herr',
    'FirstName' => 'John',
    'LastName' => 'Smith',
    'PhoneNumber' => '01234 / 123456-0',
    'MobilePhoneNumber' => '0162 / 1234567',
    'EmailAddress' => 'john.smith@somemail.com',
    'Fax' => '01234 / 123456-13'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json",
    "x-tenant-id: <x-tenant-id>"
  ],
]);

$response = curl_exec($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.jtl-cloud.com/erp/customers/{customerId}/contacts/{customerContactId}"

	payload := strings.NewReader("{\n  \"Department\": \"Management\",\n  \"Honorific\": \"Herr\",\n  \"FirstName\": \"John\",\n  \"LastName\": \"Smith\",\n  \"PhoneNumber\": \"01234 / 123456-0\",\n  \"MobilePhoneNumber\": \"0162 / 1234567\",\n  \"EmailAddress\": \"john.smith@somemail.com\",\n  \"Fax\": \"01234 / 123456-13\"\n}")

	req, _ := http.NewRequest("PATCH", url, payload)

	req.Header.Add("x-tenant-id", "<x-tenant-id>")
	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.jtl-cloud.com/erp/customers/{customerId}/contacts/{customerContactId}")
  .header("x-tenant-id", "<x-tenant-id>")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"Department\": \"Management\",\n  \"Honorific\": \"Herr\",\n  \"FirstName\": \"John\",\n  \"LastName\": \"Smith\",\n  \"PhoneNumber\": \"01234 / 123456-0\",\n  \"MobilePhoneNumber\": \"0162 / 1234567\",\n  \"EmailAddress\": \"john.smith@somemail.com\",\n  \"Fax\": \"01234 / 123456-13\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.jtl-cloud.com/erp/customers/{customerId}/contacts/{customerContactId}")

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

request = Net::HTTP::Patch.new(url)
request["x-tenant-id"] = '<x-tenant-id>'
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"Department\": \"Management\",\n  \"Honorific\": \"Herr\",\n  \"FirstName\": \"John\",\n  \"LastName\": \"Smith\",\n  \"PhoneNumber\": \"01234 / 123456-0\",\n  \"MobilePhoneNumber\": \"0162 / 1234567\",\n  \"EmailAddress\": \"john.smith@somemail.com\",\n  \"Fax\": \"01234 / 123456-13\"\n}"

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

{
  "ErrorCode": "<string>",
  "ValidationErrors": {},
  "Errors": {},
  "ErrorMessage": "<string>",
  "Stacktrace": "<string>"
}

{
  "ErrorCode": "<string>",
  "ValidationErrors": {},
  "Errors": {},
  "ErrorMessage": "<string>",
  "Stacktrace": "<string>"
}