curl -X POST --url 'https://api.onesignal.com/notifications/count-unsaved' \
  --header 'content-type: application/json; charset=utf-8' \
  --header 'authorization: Key YOUR_APP_API_KEY' \
  --data '{
    "app_id": "YOUR_APP_ID",
    "included_segments": ["Active Users"],
    "target_channel": "push"
  }'

const response = await fetch('https://api.onesignal.com/notifications/count-unsaved', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json; charset=utf-8',
    Authorization: 'Key YOUR_APP_API_KEY',
  },
  body: JSON.stringify({
    app_id: 'YOUR_APP_ID',
    included_segments: ['Active Users'],
    target_channel: 'push',
  }),
});
const data = await response.json();
console.log(data);

import json
import urllib.request

payload = {
    "app_id": "YOUR_APP_ID",
    "included_segments": ["Active Users"],
    "target_channel": "push",
}
request = urllib.request.Request(
    "https://api.onesignal.com/notifications/count-unsaved",
    data=json.dumps(payload).encode("utf-8"),
    headers={
        "Content-Type": "application/json; charset=utf-8",
        "Authorization": "Key YOUR_APP_API_KEY",
    },
    method="POST",
)
with urllib.request.urlopen(request) as response:
    print(response.read().decode("utf-8"))

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.onesignal.com/notifications/count-unsaved",
  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([
    'app_id' => 'YOUR_APP_ID',
    'included_segments' => [
        'Active Users'
    ],
    'excluded_segments' => [
        'Inactive Users'
    ],
    'filters' => [
        [
                
        ]
    ],
    'include_aliases' => [
        'external_id' => [
                'YOUR_USER_EXTERNAL_ID'
        ]
    ],
    'target_channel' => 'push'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: <authorization>",
    "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.onesignal.com/notifications/count-unsaved"

	payload := strings.NewReader("{\n  \"app_id\": \"YOUR_APP_ID\",\n  \"included_segments\": [\n    \"Active Users\"\n  ],\n  \"excluded_segments\": [\n    \"Inactive Users\"\n  ],\n  \"filters\": [\n    {}\n  ],\n  \"include_aliases\": {\n    \"external_id\": [\n      \"YOUR_USER_EXTERNAL_ID\"\n    ]\n  },\n  \"target_channel\": \"push\"\n}")

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

	req.Header.Add("Authorization", "<authorization>")
	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))

}

require 'uri'
require 'net/http'

url = URI("https://api.onesignal.com/notifications/count-unsaved")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = '<authorization>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"app_id\": \"YOUR_APP_ID\",\n  \"included_segments\": [\n    \"Active Users\"\n  ],\n  \"excluded_segments\": [\n    \"Inactive Users\"\n  ],\n  \"filters\": [\n    {}\n  ],\n  \"include_aliases\": {\n    \"external_id\": [\n      \"YOUR_USER_EXTERNAL_ID\"\n    ]\n  },\n  \"target_channel\": \"push\"\n}"

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

HttpResponse<String> response = Unirest.post("https://api.onesignal.com/notifications/count-unsaved")
  .header("Authorization", "<authorization>")
  .header("Content-Type", "application/json")
  .body("{\n  \"app_id\": \"YOUR_APP_ID\",\n  \"included_segments\": [\n    \"Active Users\"\n  ],\n  \"excluded_segments\": [\n    \"Inactive Users\"\n  ],\n  \"filters\": [\n    {}\n  ],\n  \"include_aliases\": {\n    \"external_id\": [\n      \"YOUR_USER_EXTERNAL_ID\"\n    ]\n  },\n  \"target_channel\": \"push\"\n}")
  .asString();

using RestSharp;


var options = new RestClientOptions("https://api.onesignal.com/notifications/count-unsaved");
var client = new RestClient(options);
var request = new RestRequest("");
request.AddHeader("Authorization", "<authorization>");
request.AddJsonBody("{\n  \"app_id\": \"YOUR_APP_ID\",\n  \"included_segments\": [\n    \"Active Users\"\n  ],\n  \"excluded_segments\": [\n    \"Inactive Users\"\n  ],\n  \"filters\": [\n    {}\n  ],\n  \"include_aliases\": {\n    \"external_id\": [\n      \"YOUR_USER_EXTERNAL_ID\"\n    ]\n  },\n  \"target_channel\": \"push\"\n}", false);
var response = await client.PostAsync(request);

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

false

{
  "count": 15420,
  "uncapped_count": null,
  "cap_applied": false,
  "mobile_suppressed": false,
  "mobile_excluded_count": 0
}

{
  "errors": [
    "<string>"
  ],
  "success": true,
  "reference": [
    "<string>"
  ]
}

{
  "errors": [
    "<string>"
  ],
  "success": true,
  "reference": [
    "<string>"
  ]
}