curl -i 'https://vestibule.mx.com/users/{user_guid}/members/{member_guid}' \  -H 'Accept: application/vnd.mx.atrium.v1+json' \  -H 'MX-API-Key: {mx_api_key}' \  -H 'MX-Client-ID: {mx_client_id}'

{
  "member": {
    "aggregated_at": "2016-10-13T18:07:57+00:00",
    "connection_status": "CONNECTED",
    "guid": "MBR-7c6f361b-e582-15b6-60c0-358f12466b4b",
    "identifier": "unique_id",
    "institution_code": "mxbank",
    "is_being_aggregated": false,
    "metadata": "{\"credentials_last_refreshed_at\": \"2015-10-15\"}",
    "name": "MX Bank",
    "status": "COMPLETED",
    "successfully_aggregated_at": "2016-10-13T17:57:38+00:00",
    "user_guid": "USR-fa7537f3-48aa-a683-a02a-b18940482f54"
  }
}