curl --request PATCH \
  --url https://{appId}.api-{region}.cometchat.io/v3/notifications/v1/contact-details \
  --header 'Content-Type: application/json' \
  --header 'apikey: <api-key>' \
  --header 'onBehalfOf: <onbehalfof>' \
  --data '
{
  "email": "someone@example.com",
  "phno": "+919591128691"
}
'

import requests

url = "https://{appId}.api-{region}.cometchat.io/v3/notifications/v1/contact-details"

payload = {
    "email": "someone@example.com",
    "phno": "+919591128691"
}
headers = {
    "onBehalfOf": "<onbehalfof>",
    "apikey": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'PATCH',
  headers: {
    onBehalfOf: '<onbehalfof>',
    apikey: '<api-key>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({email: 'someone@example.com', phno: '+919591128691'})
};

fetch('https://{appId}.api-{region}.cometchat.io/v3/notifications/v1/contact-details', 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://{appId}.api-{region}.cometchat.io/v3/notifications/v1/contact-details",
  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([
    'email' => 'someone@example.com',
    'phno' => '+919591128691'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "apikey: <api-key>",
    "onBehalfOf: <onbehalfof>"
  ],
]);

$response = curl_exec($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://{appId}.api-{region}.cometchat.io/v3/notifications/v1/contact-details"

	payload := strings.NewReader("{\n  \"email\": \"someone@example.com\",\n  \"phno\": \"+919591128691\"\n}")

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

	req.Header.Add("onBehalfOf", "<onbehalfof>")
	req.Header.Add("apikey", "<api-key>")
	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://{appId}.api-{region}.cometchat.io/v3/notifications/v1/contact-details")
  .header("onBehalfOf", "<onbehalfof>")
  .header("apikey", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"email\": \"someone@example.com\",\n  \"phno\": \"+919591128691\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://{appId}.api-{region}.cometchat.io/v3/notifications/v1/contact-details")

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

request = Net::HTTP::Patch.new(url)
request["onBehalfOf"] = '<onbehalfof>'
request["apikey"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"email\": \"someone@example.com\",\n  \"phno\": \"+919591128691\"\n}"

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

{
  "data": {
    "email": "someone@example.com",
    "phno": "+919591128691"
  }
}