How to check the checkbox using API?

[killedfriendz]

I am very sorry for asking this but i totally do not understand how to set values of checbox using API. 
I have checbox field on my page with name "order_status". 
So i've tried few ways to make it checked but it still doesn't work:
 

$userPage->order_status->value = 1;
$userPage->order_status->add(1);
$userPage->order_status->add(true);

Could you please tell me how to do it?

[3fingers]

$userPage->order_status = 1; // simple as that

 

[zoeck]

and don't forget to save the value/page! ? 

$userPage->save();

https://processwire.com/api/ref/page/save/