curl --request POST \
  --url https://api.livechatinc.com/v3.7/agent/action/update_customer \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "id": "b7eff798-f8df-4364-8059-649c35c9ed0c",
  "name": "Thomas Anderson",
  "email": "t.anderson@example.com",
  "suggested_email": "t.anderson@example.com",
  "avatar": "https://example.com/avatars/1.png",
  "phone_number": "+18008529001",
  "session_fields": [
    {
      "custom_key": "custom_value"
    },
    {
      "another_custom_key": "another_custom_value"
    }
  ],
  "omnichannel": {
    "fbmessenger": {
      "id": "1234567890",
      "name": "Thomas Anderson",
      "first_name": "Thomas",
      "last_name": "Anderson",
      "profile_pic": "https://example.com/avatars/1.png",
      "gender": "male",
      "locale": "en_US",
      "is_verified_user": true
    },
    "twilio": {
      "phone_number": "+18008529001"
    },
    "whatsapp": {
      "id": "15550000001",
      "name": "Thomas Anderson",
      "phone_number": "+15550000001"
    }
  },
  "address": {
    "address": "1600 Pennsylvania Avenue NW",
    "city": "Washington",
    "country": "United States",
    "state": "DC",
    "postal_code": "20500"
  }
}
'

import requests

url = "https://api.livechatinc.com/v3.7/agent/action/update_customer"

payload = {
    "id": "b7eff798-f8df-4364-8059-649c35c9ed0c",
    "name": "Thomas Anderson",
    "email": "t.anderson@example.com",
    "suggested_email": "t.anderson@example.com",
    "avatar": "https://example.com/avatars/1.png",
    "phone_number": "+18008529001",
    "session_fields": [{ "custom_key": "custom_value" }, { "another_custom_key": "another_custom_value" }],
    "omnichannel": {
        "fbmessenger": {
            "id": "1234567890",
            "name": "Thomas Anderson",
            "first_name": "Thomas",
            "last_name": "Anderson",
            "profile_pic": "https://example.com/avatars/1.png",
            "gender": "male",
            "locale": "en_US",
            "is_verified_user": True
        },
        "twilio": { "phone_number": "+18008529001" },
        "whatsapp": {
            "id": "15550000001",
            "name": "Thomas Anderson",
            "phone_number": "+15550000001"
        }
    },
    "address": {
        "address": "1600 Pennsylvania Avenue NW",
        "city": "Washington",
        "country": "United States",
        "state": "DC",
        "postal_code": "20500"
    }
}
headers = {
    "Authorization": "Basic <encoded-value>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Basic <encoded-value>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    id: 'b7eff798-f8df-4364-8059-649c35c9ed0c',
    name: 'Thomas Anderson',
    email: 't.anderson@example.com',
    suggested_email: 't.anderson@example.com',
    avatar: 'https://example.com/avatars/1.png',
    phone_number: '+18008529001',
    session_fields: [{custom_key: 'custom_value'}, {another_custom_key: 'another_custom_value'}],
    omnichannel: {
      fbmessenger: {
        id: '1234567890',
        name: 'Thomas Anderson',
        first_name: 'Thomas',
        last_name: 'Anderson',
        profile_pic: 'https://example.com/avatars/1.png',
        gender: 'male',
        locale: 'en_US',
        is_verified_user: true
      },
      twilio: {phone_number: '+18008529001'},
      whatsapp: {id: '15550000001', name: 'Thomas Anderson', phone_number: '+15550000001'}
    },
    address: {
      address: '1600 Pennsylvania Avenue NW',
      city: 'Washington',
      country: 'United States',
      state: 'DC',
      postal_code: '20500'
    }
  })
};

fetch('https://api.livechatinc.com/v3.7/agent/action/update_customer', 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.livechatinc.com/v3.7/agent/action/update_customer",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'id' => 'b7eff798-f8df-4364-8059-649c35c9ed0c',
    'name' => 'Thomas Anderson',
    'email' => 't.anderson@example.com',
    'suggested_email' => 't.anderson@example.com',
    'avatar' => 'https://example.com/avatars/1.png',
    'phone_number' => '+18008529001',
    'session_fields' => [
        [
                'custom_key' => 'custom_value'
        ],
        [
                'another_custom_key' => 'another_custom_value'
        ]
    ],
    'omnichannel' => [
        'fbmessenger' => [
                'id' => '1234567890',
                'name' => 'Thomas Anderson',
                'first_name' => 'Thomas',
                'last_name' => 'Anderson',
                'profile_pic' => 'https://example.com/avatars/1.png',
                'gender' => 'male',
                'locale' => 'en_US',
                'is_verified_user' => true
        ],
        'twilio' => [
                'phone_number' => '+18008529001'
        ],
        'whatsapp' => [
                'id' => '15550000001',
                'name' => 'Thomas Anderson',
                'phone_number' => '+15550000001'
        ]
    ],
    'address' => [
        'address' => '1600 Pennsylvania Avenue NW',
        'city' => 'Washington',
        'country' => 'United States',
        'state' => 'DC',
        'postal_code' => '20500'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Basic <encoded-value>",
    "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.livechatinc.com/v3.7/agent/action/update_customer"

	payload := strings.NewReader("{\n  \"id\": \"b7eff798-f8df-4364-8059-649c35c9ed0c\",\n  \"name\": \"Thomas Anderson\",\n  \"email\": \"t.anderson@example.com\",\n  \"suggested_email\": \"t.anderson@example.com\",\n  \"avatar\": \"https://example.com/avatars/1.png\",\n  \"phone_number\": \"+18008529001\",\n  \"session_fields\": [\n    {\n      \"custom_key\": \"custom_value\"\n    },\n    {\n      \"another_custom_key\": \"another_custom_value\"\n    }\n  ],\n  \"omnichannel\": {\n    \"fbmessenger\": {\n      \"id\": \"1234567890\",\n      \"name\": \"Thomas Anderson\",\n      \"first_name\": \"Thomas\",\n      \"last_name\": \"Anderson\",\n      \"profile_pic\": \"https://example.com/avatars/1.png\",\n      \"gender\": \"male\",\n      \"locale\": \"en_US\",\n      \"is_verified_user\": true\n    },\n    \"twilio\": {\n      \"phone_number\": \"+18008529001\"\n    },\n    \"whatsapp\": {\n      \"id\": \"15550000001\",\n      \"name\": \"Thomas Anderson\",\n      \"phone_number\": \"+15550000001\"\n    }\n  },\n  \"address\": {\n    \"address\": \"1600 Pennsylvania Avenue NW\",\n    \"city\": \"Washington\",\n    \"country\": \"United States\",\n    \"state\": \"DC\",\n    \"postal_code\": \"20500\"\n  }\n}")

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

	req.Header.Add("Authorization", "Basic <encoded-value>")
	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.post("https://api.livechatinc.com/v3.7/agent/action/update_customer")
  .header("Authorization", "Basic <encoded-value>")
  .header("Content-Type", "application/json")
  .body("{\n  \"id\": \"b7eff798-f8df-4364-8059-649c35c9ed0c\",\n  \"name\": \"Thomas Anderson\",\n  \"email\": \"t.anderson@example.com\",\n  \"suggested_email\": \"t.anderson@example.com\",\n  \"avatar\": \"https://example.com/avatars/1.png\",\n  \"phone_number\": \"+18008529001\",\n  \"session_fields\": [\n    {\n      \"custom_key\": \"custom_value\"\n    },\n    {\n      \"another_custom_key\": \"another_custom_value\"\n    }\n  ],\n  \"omnichannel\": {\n    \"fbmessenger\": {\n      \"id\": \"1234567890\",\n      \"name\": \"Thomas Anderson\",\n      \"first_name\": \"Thomas\",\n      \"last_name\": \"Anderson\",\n      \"profile_pic\": \"https://example.com/avatars/1.png\",\n      \"gender\": \"male\",\n      \"locale\": \"en_US\",\n      \"is_verified_user\": true\n    },\n    \"twilio\": {\n      \"phone_number\": \"+18008529001\"\n    },\n    \"whatsapp\": {\n      \"id\": \"15550000001\",\n      \"name\": \"Thomas Anderson\",\n      \"phone_number\": \"+15550000001\"\n    }\n  },\n  \"address\": {\n    \"address\": \"1600 Pennsylvania Avenue NW\",\n    \"city\": \"Washington\",\n    \"country\": \"United States\",\n    \"state\": \"DC\",\n    \"postal_code\": \"20500\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.livechatinc.com/v3.7/agent/action/update_customer")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Basic <encoded-value>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"id\": \"b7eff798-f8df-4364-8059-649c35c9ed0c\",\n  \"name\": \"Thomas Anderson\",\n  \"email\": \"t.anderson@example.com\",\n  \"suggested_email\": \"t.anderson@example.com\",\n  \"avatar\": \"https://example.com/avatars/1.png\",\n  \"phone_number\": \"+18008529001\",\n  \"session_fields\": [\n    {\n      \"custom_key\": \"custom_value\"\n    },\n    {\n      \"another_custom_key\": \"another_custom_value\"\n    }\n  ],\n  \"omnichannel\": {\n    \"fbmessenger\": {\n      \"id\": \"1234567890\",\n      \"name\": \"Thomas Anderson\",\n      \"first_name\": \"Thomas\",\n      \"last_name\": \"Anderson\",\n      \"profile_pic\": \"https://example.com/avatars/1.png\",\n      \"gender\": \"male\",\n      \"locale\": \"en_US\",\n      \"is_verified_user\": true\n    },\n    \"twilio\": {\n      \"phone_number\": \"+18008529001\"\n    },\n    \"whatsapp\": {\n      \"id\": \"15550000001\",\n      \"name\": \"Thomas Anderson\",\n      \"phone_number\": \"+15550000001\"\n    }\n  },\n  \"address\": {\n    \"address\": \"1600 Pennsylvania Avenue NW\",\n    \"city\": \"Washington\",\n    \"country\": \"United States\",\n    \"state\": \"DC\",\n    \"postal_code\": \"20500\"\n  }\n}"

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