Laravel - Notifications - Formatting Sms Notifications

If a notification supports being sent as an SMS, you should define a toNexmo method on the notification class. This method will receive a $notifiable entity and should return an Illuminate\Notifications\Messages\NexmoMessage instance:

     * Get the Vonage / SMS representation of the notification.
     * @param  mixed  $notifiable
     * @return \Illuminate\Notifications\Messages\NexmoMessage
    public function toNexmo($notifiable)
        return (new NexmoMessage)
                    ->content('Your SMS message content');