i have you need GET/friends/ids, where it returns the IDs of all the users that someone follows, but since it’s only IDs, it does this in groups of 5000 per page,
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welcome to see my

Hello, I’ve added an optional parameter rest_id to the following endpoint.

If the rest_id is set, screenname is ignored.
So you can pass a randon string to screenname and the needed rest_id as an optional parameter.

Is it what you need?