Hi Sascha,
you can find the IDs when navigating to "User directories" (easiest way by pressing dot and then typing User directories).
Please see here for further information: https://confluence.atlassian.com/adminjiraserver079/configuring-user-directories-950288323.html
This is feasible if you need it one time.
I am not sure if the IDs are requestable via API. Via database it is also possible.
Cheers,
Daniel
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