Send SMS using Elimuswift SMS package

DueInvoiceReminder.php

<?php
use App\Invoice;
use Elimuswift\SMS\Chennels\SMSChannel;
use Elimuswift\SMS\Notifications\SMSMessage;
use Illuminate\Notifications\Notification;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;

class DueInvoiceReminder extends Notification implements ShouldQueue
{
    use Queueable;

    protected $invoice;

    public function __construct(Invoice $invoice) {
        $this->invoice = $invoice;
    }
    
    public function via($notifiable)
    {
        return [SMSChannel::class];
    }

    public function toSms($notifiable)
    {
        return (new SMSMessage())
            ->content("Dear {$notifiable->name} 
                      Your account has an oustanding oumount of 
                      {$this->invoice->due_amount} please make arrangements to pay this invoice
                      on or before {$this->invoice->due_date}!");
    }
}

// To send this notification all users with a due balance of 500 you need to do this
Invoice::where('due_amount', '>', 500)->get()->each(function($invoice) {
    return $invoice->user->notify(new DueInvoiceReminder($invoice));
});