Check segment membership and get per-user Updates through the API

We show Featurebase Updates inside our own app through the API. Each Update returns allowedSegmentIds, but the API has no way to tell which users are in those segments, so we can't honor segment targeting outside the Featurebase widget.

Any one of these would solve it:

• Return the Updates visible to a given user (by userId), with segment targeting applied by Featurebase. This would be ideal.

• Check whether a contact is in a segment (by userId).

• List a segment's members.

Without this, the only option is to rebuild the segment rules on our side and keep them in sync, which is fragile. If our copy drifts, an Update meant for a pilot group reaches everyone.