curl --request DELETE \
  --url https://app.demand-iq.com/api/notifications/subscriptions/{subscriptionId} \
  --cookie session=

import requests

url = "https://app.demand-iq.com/api/notifications/subscriptions/{subscriptionId}"

headers = {"cookie": "session="}

response = requests.delete(url, headers=headers)

print(response.text)

const options = {method: 'DELETE', headers: {cookie: 'session='}};

fetch('https://app.demand-iq.com/api/notifications/subscriptions/{subscriptionId}', 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://app.demand-iq.com/api/notifications/subscriptions/{subscriptionId}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "DELETE",
  CURLOPT_COOKIE => "session=",
]);

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

curl_close($curl);

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

package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

	url := "https://app.demand-iq.com/api/notifications/subscriptions/{subscriptionId}"

	req, _ := http.NewRequest("DELETE", url, nil)

	req.Header.Add("cookie", "session=")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.delete("https://app.demand-iq.com/api/notifications/subscriptions/{subscriptionId}")
  .header("cookie", "session=")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://app.demand-iq.com/api/notifications/subscriptions/{subscriptionId}")

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

request = Net::HTTP::Delete.new(url)
request["cookie"] = 'session='

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

{
  "success": true
}

{
  "error": "<string>"
}

{
  "error": "<string>"
}

{
  "error": "<string>"
}