curl --request PUT \
  --url https://api.hubapi.com/crm/lists/2026-03/{listId}/memberships/add \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '[
  "<string>"
]'

{
  "recordIdsMissing": [
    "<string>"
  ],
  "recordIdsRemoved": [
    "<string>"
  ],
  "recordsIdsAdded": [
    "<string>"
  ]
}