Set conditional object properties

You can use the when() or unless() methods in your MailMessage notifications to set conditional object properties like a call to action.

class InvoicePaid extends Notification
{
    public function toMail(User $user)
    {
        return (new MailMessage)
            ->success()
            ->line('We\'ve received your payment')
            ->when($user->isOnMonthlyPaymentPlan(), function (MailMessage $message) {
                $message->action('Save 20% by paying yearly', route('account.billing'));
            })
            ->line('Thank you for using Unlock.sh');
    }
}

Use the when or unless methods in you own classes by using the Illuminate\Support\Traits\Conditionable trait

Tip given by @Philo01