curl --request GET \
  --url https://api.portable.io/v2/flows/{id} \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "id": 689422,
    "displayName": "My Google Calendar to BigQuery Flow",
    "source": 80190,
    "destination": 689422,
    "frequency": "manual"
  }
}