Send Laravel Cashier invoices as an attachment

<?php

namespace App\Notifications;

use Illuminate\Bus\Queueable;
use Illuminate\Notifications\Notification;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Notifications\Messages\MailMessage;
use PDF;


// This example uses Laravel 5.5, Cashier 7.0.13, and requires the barryvdh/laravel-dompdf package.

class InvoiceChargeSucceeded extends Notification
{
    use Queueable;

    /**
     * Create a new notification instance.
     *
     * @return void
     */
    public function __construct($invoice, $user)
    {
        $this->invoice = $invoice;
        $this->user = $user;

    }

    /**
     * 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)
    {
        $invoice = $this->invoice;
        $total = $invoice->total();
        $user_name = $this->user->name;
        $company_name = $this->user->company;

        // Make sure you have barryvdh/laravel-dompdf installed, and have set the PDF facade up in your config/app.php
        // facades section, per the laravel-dompdf documentation. 
        $pdf = PDF::loadview('cashier.receipt', compact('invoice','company_name','user_name', 'total'));

        return (new MailMessage)->markdown('mail.account.invoice-succeeded', [
            'invoice' => $invoice,
            'total'  => $total,
            'user_name'  => $user_name,
            'company_name'  => $company_name
        ])
            ->attachData($pdf->output(), $invoice->id . '-'.date('Y-m-d').'.pdf', ['mime' => 'application/pdf'])
            ->subject('Payment Processed');
    }

    /**
     * Get the array representation of the notification.
     *
     * @param  mixed  $notifiable
     * @return array
     */
    public function toArray($notifiable)
    {
        return [
            //
        ];
    }
}

I found that Cashier under the hood uses Dompdf so it's already been installed. We can generate the pdf like this:

$this->pdf = (new DompdfInvoiceRenderer())->render($invoice, $data);

@hmreumann The question was never how to generate a PDF, it was to send the PDF as an attachment in email via notifications. Also, this thread is from 2018. A lot has changed in cashier and stripe since then.

Regardless, Dompdf is what we're calling when we say use PDF, as the installation of Dompdf has you set that as an alias in your app config.

Glad you found a solution that works for you.