Identity Api inside a custom application page

Hi

Just needed some information .

Is it possible to use the Identity APi inside a Custom application page.

I am using a Custom App page to display business data. This page is not a part of the portal but a part of Bonita Living app.

Here I wanted to use the Api to find the username and other details .

Somehow its not responding here. Does not return any data .( am i doing something wrong)

Hence i was wondering if we could use this api as a part of our Designer page. ?

I am using Bonita 7.1.2

Adding some more information

I have a External Api like getUser = /bonita/API/identity/user/{{item.author}}

inside the container i have something like {{getUser.username}}

Thanks

try

{{getUser.username.value}}

regards