curl --request GET \
  --url https://api.opal.dev/v1/groups/{group_id}/resources \
  --header 'Authorization: Bearer <token>'

{
  "group_resources": [
    {
      "group_id": "7870617d-e72a-47f5-a84c-693817ab4567",
      "resource_id": "1520617d-e72a-47f5-a84c-693817ab48ad2",
      "access_level_remote_id": ""
    },
    {
      "group_id": "50333e67-73ce-47ab-b049-d8abcd45f7a1",
      "resource_id": "6f99639b-7928-4043-8184-47cbc6766145",
      "access_level_remote_id": "write"
    }
  ]
}