To create a new notification class in Laravel 9, you can use the make:notification Artisan command. This command will generate a new notification class in the app/Notifications directory.

Here is an example of how to use the make:notification command to create a new notification class:

php artisan make:notification MyNotification

This will create a new notification class called MyNotification in the app/Notifications directory. You can then open this file and customize it to define the email subject, body, and any other details of the notification.

Here is an example of a basic notification class:

<?php

namespace App\Notifications;

use Illuminate\Notifications\Notification;

class MyNotification extends Notification
{
    /**
     * The subject of the notification.
     *
     * @var string
     */
    public $subject;

    /**
     * The body of the notification.
     *
     * @var string
     */
    public $body;

    /**
     * Create a new notification instance.
     *
     * @param  string  $subject
     * @param  string  $body
     * @return void
     */
    public function __construct($subject, $body)
    {
        $this->subject = $subject;
        $this->body = $body;
    }

    /**
     * Get the notification's channels.
     *
     * @param  mixed  $notifiable
     * @return array
     */
    public function via($notifiable)
    {
        return ['mail'];
    }

    /**
     * Get the mail representation of the notification.
     *
     * @param  mixed  $notifiable
     * @return \Illuminate\Notifications\Messages\MailMessage
     */
    public function toMail($notifiable)
    {
        return (new MailMessage)
                    ->subject($this->subject)
                    ->line($this->body);
    }
}

In this example, the MyNotification class extends the Illuminate\Notifications\Notification class and defines the via and toMail methods. The via method specifies that this notification should be sent via email, and the toMail method defines the email subject and body using the values provided in the constructor.

To send a notification email in Laravel, you can use the notify method on a user instance. This method accepts an instance of a notification class, which defines the email content and recipients.

Here is an example of how to use the notify method to send a notification email:

<?php
use App\Notifications\MyNotification;
use App\User;

// Get the user instance
$user = User::find(1);

// Create a new notification instance
$notification = new MyNotification('Subject of your Notification', 'This is the body of the email');

// Send the notification
$user->notify($notification);

For more information on creating and using notifications in Laravel, you can refer to the Laravel documentation on notifications.

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