Get Group data by userId not only for own user

Hello!
I have several devices grouped using Groups.
The devices and groups have my private attributes, such as ProtocolVer, SMSCenter, MailServer, etc.
I use API/DEVICES?uiniqueId=.... to retrieve device attribute information.
But for convenience, the group attributes are the same, so I don't have to specify all the attributes for each device each time.
Then, I get the group attributes using API/GROUPS the hard way:
I load all the groups and find the group with the ID obtained from API/DEVICES?uniqueID=
API/GROUPS has a userId, but it only works for the device owner, as I understand it, under their account.
The problem is that I need my shared server to handle this processing and make decisions based on the attributes.

Is it possible to make API/DEVICES/userID work not only for the device owner, but also for the account that has access rights to their devices?

PS.

Currently, I have to first download data for all groups, and only then select the groups and their data that have groups assigned to the uniqueID in API/DEVICES.

Too much unnecessary traffic

So, now Im tested the /api/groups?userId=... when I used Basic Auth method with server's account with grand priveleges. And it is worked.
Where is the problem in doc's description https://www.traccar.org/api-reference/#tag/Groups
"integer Standard users can use this only with their own userId"
or it is a bug in traccar's API that is works now as I need?

Sorry, I misled you. I use uinqueId (in api/devices?uniqueId=...) to get the device's group ID, and then use it to get the group's attributes from the loading and parsing list of all data all groups (by api/groups)

I need to use simple API/GROUPS?id=..... , where id - is ID of the group. Or list of groups assigned to the device.

So you resolved your problem?

No. I need api/groups?id=... for get information about group by id group.
Now I getting list of all groups by api/groups, than parse the list to get group with my ID.

There is already GET /api/groups/{id} available.

Sorry, Do I something wrong?:

https://myserver.com/api/groups?id=1

and get all groups.
not only group with id =1

Please carefully check my previous message again.

Or thank you! it works.
Why it isn't described in API docs?

I answer myself: because that's standard rule for REST API request format for single object.
Anton, sorry for wasting your time

It is documented now.