Returns the list of expired file pushes.
curl -X GET \ -H "Authorization: Bearer MyAPIToken" \ https://pwpush.com/f/expired.json
[ { "url_token": "fkwjfvhall92", "created_at": "2023-10-20T15:32:01Z", "expires_on": "2023-10-23T15:32:01Z", ... }, ]