Adds a list of members to a subcommunity in the community associated with your API key. You can include up to 1,000 member IDs per request.

Adding is additive. Members keep any subcommunities they already belong to, and members already in this subcommunity stay in it. To remove members, use DELETE /subcommunities/{subcommunity_id}/members.

The response is a SubcommunityMembersResponse, which reports the result of the operation.