SmartThings API - problems with installed apps id


I use this api:

And I have two questions:

  1. Is this API is up-to-date? And everything should work correctly?
  2. I am trying to get installed apps because I need appId to my former work:

my api reques is :
but I am getting only empty object sth like that:
“items”: [],
"_links": {}
code :200
But in this location in my IDE I have installed apps on my location page and I can see them there. So where can be problem?

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