curl --request GET \
  --url https://api.withorb.com/v1/plans/{plan_id}/migrations \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "id": "<string>",
      "plan_id": "<string>",
      "effective_time": "2023-12-25"
    }
  ],
  "pagination_metadata": {
    "has_more": true,
    "next_cursor": "<string>"
  }
}