akaunting/akaunting

use Illuminate\Notifications\Notification as BaseNotification;

abstract class Notification extends BaseNotification
{
    public function initMessage()
    {
        app('url')->defaults(['company_id' => company_id()]);

        $message = (new MailMessage)
            ->from(config('mail.from.address'), config('mail.from.name'))
            ->subject($this->getSubject())
            ->view('partials.email.body', ['body' => $this->getBody()]);

        return $message;
    }
}

use App\Abstracts\Notification;
use App\Models\Common\EmailTemplate;

class Invoice extends Notification
{
    public $invoice;

    public $template;

    public $attach_pdf;

    public function __construct($invoice = null, $template_alias = null, $attach_pdf = false)
    {
        parent::__construct();

        $this->invoice = $invoice;
        $this->template = EmailTemplate::alias($template_alias)->first();
        $this->attach_pdf = $attach_pdf;
    }

    public function toMail($notifiable)
    {
        $message = $this->initMessage();

        // Attach the PDF file
        if ($this->attach_pdf) {
            $message->attach($this->storeDocumentPdfAndGetPath($this->invoice), [
                'mime' => 'application/pdf',
            ]);
        }

        return $message;
    }
}

use App\Notifications\Sale\Invoice as Notification;
use App\Abstracts\Http\Controller;

class Invoices extends Controller
{
    //
    public function emailInvoice(Document $invoice)
    {
        if (empty($invoice->contact_email)) {
            return redirect()->back();
        }

        // Notify the customer
        $invoice->contact->notify(new Notification($invoice, 'invoice_new_customer', true));

        event(new \App\Events\Document\DocumentSent($invoice));

        flash(trans('documents.messages.email_sent', ['type' => trans_choice('general.invoices', 1)]))->success();

        return redirect()->back();
    }
}