curl --request PATCH \
  --url https://api.messaging.phonovation.com/people/3/lists/{listName} \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
[
  {
    "__id": "78f47a5a-b9c4-4802-8bed-e81cf5fde0b4",
    "item_field_#1": "new value",
    "item_field_#2": null
  },
  {
    "__id": "b606345f-f7a6-4b9d-b9f1-75bdeaf0e55f",
    "item_field_#1": "new value",
    "item_field_#2": 42
  }
]
'

import requests

url = "https://api.messaging.phonovation.com/people/3/lists/{listName}"

payload = [
    {
        "__id": "78f47a5a-b9c4-4802-8bed-e81cf5fde0b4",
        "item_field_#1": "new value",
        "item_field_#2": None
    },
    {
        "__id": "b606345f-f7a6-4b9d-b9f1-75bdeaf0e55f",
        "item_field_#1": "new value",
        "item_field_#2": 42
    }
]
headers = {
    "Authorization": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

using RestSharp;


var options = new RestClientOptions("https://api.messaging.phonovation.com/people/3/lists/{listName}");
var client = new RestClient(options);
var request = new RestRequest("");
request.AddHeader("Authorization", "<api-key>");
request.AddJsonBody("[\n  {\n    \"__id\": \"78f47a5a-b9c4-4802-8bed-e81cf5fde0b4\",\n    \"item_field_#1\": \"new value\",\n    \"item_field_#2\": null\n  },\n  {\n    \"__id\": \"b606345f-f7a6-4b9d-b9f1-75bdeaf0e55f\",\n    \"item_field_#1\": \"new value\",\n    \"item_field_#2\": 42\n  }\n]", false);
var response = await client.PatchAsync(request);

Console.WriteLine("{0}", response.Content);

HttpResponse<String> response = Unirest.patch("https://api.messaging.phonovation.com/people/3/lists/{listName}")
  .header("Authorization", "<api-key>")
  .header("Content-Type", "application/json")
  .body("[\n  {\n    \"__id\": \"78f47a5a-b9c4-4802-8bed-e81cf5fde0b4\",\n    \"item_field_#1\": \"new value\",\n    \"item_field_#2\": null\n  },\n  {\n    \"__id\": \"b606345f-f7a6-4b9d-b9f1-75bdeaf0e55f\",\n    \"item_field_#1\": \"new value\",\n    \"item_field_#2\": 42\n  }\n]")
  .asString();

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.messaging.phonovation.com/people/3/lists/{listName}",
  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([
    [
        '__id' => '78f47a5a-b9c4-4802-8bed-e81cf5fde0b4',
        'item_field_#1' => 'new value',
        'item_field_#2' => null
    ],
    [
        '__id' => 'b606345f-f7a6-4b9d-b9f1-75bdeaf0e55f',
        'item_field_#1' => 'new value',
        'item_field_#2' => 42
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: <api-key>",
    "Content-Type: application/json"
  ],
]);

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

curl_close($curl);

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

const options = {
  method: 'PATCH',
  headers: {Authorization: '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify([
    {
      __id: '78f47a5a-b9c4-4802-8bed-e81cf5fde0b4',
      'item_field_#1': 'new value',
      'item_field_#2': null
    },
    {
      __id: 'b606345f-f7a6-4b9d-b9f1-75bdeaf0e55f',
      'item_field_#1': 'new value',
      'item_field_#2': 42
    }
  ])
};

fetch('https://api.messaging.phonovation.com/people/3/lists/{listName}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));