# The Web Push Service

The WebPush object requires a PSR-17 Request Factory, a PSR-18 Http Client and an [Extension Manager](/v2.0/the-library/advanced-service.md).

```php
use Nyholm\Psr7\Factory\Psr17Factory;
use Symfony\Component\HttpClient\Psr18Client;
use WebPush\WebPush;

$client = new Psr18Client();
$requestFactory = new Psr17Factory();

$service = new WebPush($client, $requestFactory, $extensionManager);
```

The service is now ready to send Notifications to the Subscriptions. The StatusReport object that is returned [is explained here](/v2.0/common-concepts/the-status-report.md).

```php
<?php

use WebPush\Subscription;
use WebPush\Notification;

$subscription = Subscription::createFromString('{"endpoint":"https://updates.push.services.mozilla.com/wpush/v2/AAAAAAAA[…]AAAAAAAAA","keys":{"auth":"XXXXXXXXXXXXXX","p256dh":"YYYYYYYY[…]YYYYYYYYYYYYY"}}');
$notification = Notification::create()
    ->withPayload('Hello world')
;

$statusReport = $service->send($notification, $subscription);
```

{% hint style="info" %}
In this example, we load the Subscription object from a string, but usually to retrieve the Subscription objects from a database or a dedicated storage.
{% endhint %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://web-push.spomky-labs.com/v2.0/the-library/the-web-push-service.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.