data.attributes.list_id in the request body; the list's list_type determines whether company or contact references are accepted. The members are supplied either as an explicit data.attributes.items array (up to 100 items per request), or — for company lists only — as a data.attributes.advanced_search selection that is resolved into companies (up to 100,000) when the job runs. To add members, use POST /v1/lists/batch-add-to-list-jobs — adding and removing are separate jobs.202 Accepted with a job handle. Poll GET /v1/lists/batch-remove-from-list-jobs/{job_id} to observe progress and the outcome: per-item results plus summary counts for items jobs, summary counts only for advanced_search jobs.lists:write OAuth2 scope.