Magento 1: Where is oauth_admin.php

The rest documentation for Magento 1 make mention of an oauth_admin.php file

$callbackUrl = "http://yourhost/oauth_admin.php";
$temporaryCredentialsRequestUrl = "http://yourhost/oauth/initiate?oauth_callback=" . urlencode($callbackUrl);
$adminAuthorizationUrl = 'http://yourhost/admin/oAuth_authorize';
$accessTokenRequestUrl = 'http://yourhost/oauth/token';
$apiUrl = 'http://yourhost/api/rest';
$consumerKey = 'yourconsumerkey';
$consumerSecret = 'yourconsumersecret';

This appears to be the file/URL that oauth will redirect to after the User Authorization step.

The docs fails to clearly say what this oauth_admin.php program/script needs to do with the oauth_token and and oauth_verifier variables it receives in order to work with the rest of the code sample.

Does this file exist anywhere in the docs and/or elsewhere? If not is there known science for getting Magento 1’s three legged oauth working?