Convert the Laravel Spark invoice email to a notification email

custom.php

<?php // routes/custom.php

/*
|--------------------------------------------------------------------------
| Custom Routes
|--------------------------------------------------------------------------
|
| These routes have no middleware or namespace set.
|
*/

Route::post('/webhook/stripe', 'App\Extensions\StripeWebhookController@handleWebhook');

InvoicePaid.php

<?php // app/Notifications/InvoicePaid.php

namespace App\Notifications;

use Illuminate\Bus\Queueable;
use Illuminate\Notifications\Notification;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Notifications\Messages\MailMessage;
use Laravel\Cashier\Invoice;

class InvoicePaid extends Notification
{
    use Queueable;

    protected $billable;
    protected $invoice;

    /**
     * Create a new notification instance.
     *
     * @param mixed $billable
     * @param Invoice $invoice
     */
    public function __construct($billable, Invoice $invoice)
    {
        $this->billable = $billable;
        $this->invoice  = $invoice;
    }

    /**
     * Get the notification's delivery 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)
    {
        $invoiceData = \Spark::invoiceDataFor($this->billable);

        $mailMessage = (new MailMessage)->subject($invoiceData['product'] . ' Invoice')
                                        ->greeting('Hi ' . explode(' ', $this->billable->name)[0] . '!')
                                        ->line('Thanks for your continued support. We\'ve attached a copy of your invoice for your records. Please let us know if you have any questions or concerns!')
                                        ->attachData($this->invoice->pdf($invoiceData), 'invoice.pdf');

        return $mailMessage;
    }
}

RouteServiceProvider.php

<?php // app/Providers/RouteServiceProvider.php

namespace App\Providers;

use Illuminate\Support\Facades\Route;
use Illuminate\Foundation\Support\Providers\RouteServiceProvider as ServiceProvider;

class RouteServiceProvider extends ServiceProvider
{
    /**
     * ...
     */
    
    /**
     * Define the routes for the application.
     *
     * @return void
     */
    public function map()
    {
        // ...

        $this->mapCustomRoutes();
    }

    protected function mapCustomRoutes()
    {
        require base_path('routes/custom.php');
    }
}

StripeWebhookController.php

<?php // app/Extensions/StripeWebhookController.php

namespace App\Extensions;

use App\Notifications\InvoicePaid;
use Laravel\Spark\Http\Controllers\Settings\Billing\StripeWebhookController as SparkStripeWebhookController;

class StripeWebhookController extends SparkStripeWebhookController
{
    /**
     * Send an invoice notification e-mail.
     *
     * @param  mixed $billable
     * @param  \Laravel\Cashier\Invoice
     * @return void
     */
    protected function sendInvoiceNotification($billable, $invoice)
    {
        $billable->notify(new InvoicePaid($billable, $invoice));
    }
}