Is https://getapidoc.staah.net API documentation still valid ?

Is https://getapidoc.staah.net API documentation still valid ?

Hi!
I have used the above documentation (https://getapidoc.staah.net) APIs to get the room rates, availability and restrictions to display on my hotel website. But all the APIs given 403 Forbidden error: You don't have permission to access this resource.

Is this documentation still valid or can I access my hotel room rates, availability and restrictions to display on my hotel website?
Because I use the staah.com booking engine as the primary booking method for my hotel.

Thank You