if paypal plan has “inactive” status?

Hello, Testing pagination in laravel 5 app with request

Working with Update Plan API http://paypal.github.io/PayPal-PHP-SDK/sample/doc/billing/UpdatePlan.html I did not find if plan has “inactive” state and which key have I to use for it? I made :

   $value = new PayPalModel('{
       "state":"INACTIVE"
     }');

But got error : Requested state change is invalid.

1. How valid?

2. If in my developer's account there is a page where I can see all my plans and work with them in my developer's account ?

Thanks!