Fetching all profiles in a list, including custom attributes

Hello,

Is there a way to have the group API endpoint (/group/*id*/members/all) return custom properties in the profiles? Right now it only seems to be returning email and ID.

We are periodically checking for user profile updates on our end, and updating Klayvio via the Identify API. The issue is that we have no way to tell if a user already has these properties set on Klayvio’s end - so we are forced to mass update 8k+ profiles when we could have just done a few. 

This will become more of an issue as our userbase grows.

Thanks!

David.