curl --request GET \
  --url https://api.hubapi.com/crm/v3/lists/{listId}/memberships \
  --header 'Authorization: Bearer <token>'

{
  "paging": {
    "next": {
      "after": "AAAAAAAAAS0%3D",
      "link": "https://private.hubapi.com/crm/v3/lists/123/memberships?portalId=865747473&limit=2&after=AAAAAAAAAS0%3D"
    },
    "prev": {
      "before": "AAAAAAAAAMk%3D",
      "link": "https://private.hubapi.com/crm/v3/lists/123/memberships?before=AAAAAAAAAMk%3D&portalId=865747473&limit=2"
    }
  },
  "results": [
    {
      "membershipTimestamp": "2023-11-07T16:46:04.122Z",
      "recordId": "202"
    },
    {
      "membershipTimestamp": "2023-11-07T16:46:04.122Z",
      "recordId": "232"
    },
    {
      "membershipTimestamp": "2023-11-07T16:46:04.122Z",
      "recordId": "239"
    }
  ],
  "total": 330
}