curl --request GET \
  --url https://api.hubapi.com/crm/lists/2026-03/{listId}/memberships \
  --header 'Authorization: Bearer <token>'

{
  "results": [
    {
      "membershipTimestamp": "2023-11-07T05:31:56Z",
      "recordId": "<string>"
    }
  ],
  "paging": {
    "next": {
      "after": "<string>",
      "link": "<string>"
    },
    "prev": {
      "before": "<string>",
      "link": "<string>"
    }
  },
  "total": 123
}