// config/mocean.php
...
'MOCEAN_API_KEY' => 'YOUR MOCEAN_API_KEY',
'MOCEAN_API_SECRET' => 'YOUR MOCEAN_API_SECRET',
...

use Illuminate\Bus\Queueable;
use Illuminate\Notifications\Notification;
use NotificationChannels\MoceanApi\MoceanApiChannel;
use NotificationChannels\MoceanApi\MoceanApiSmsMessage;

class InvoicePaid extends Notification
{
    use Queueable;
    
    public function via($notifiable)
    {
        return [MoceanApiChannel::class];
    }
    
    public function toMoceanapi($notifiable)
    {
        //return the text message u want to send here
        return 'You have received an invoice';
        
        //you can also return an array for custom options, refer moceanapi docs
        return [
            'mocean-text' => 'You have received an invoice',
            'mocean-dlr-url' => 'https://test.com'
        ];

        //you can also return a MoceanApiSmsMessage instance
        return (new MoceanApiSmsMessage())
            ->setText('You have received an invoice');
    }
}

use Illuminate\Notifications\Notifiable;
use Illuminate\Foundation\Auth\User as Authenticatable;

class User extends Authenticatable
{
    use Notifiable;
    
    public function routeNotificationForMoceanapi($notification)
    {
        //make sure user model has this attribute, else the notification will not be sent
        return $this->phone;
    }
}

$user->notify(new InvoicePaid());

use Notification;

Notification:route('moceanapi', '60123456789')
    ->notify(new InvoicePaid());