To use, just specify this site as your OAuth 2.0 redirect URI and pass in the name of your Shortcut. e.g.
https://oauth.frenchesco.com/redirect.php?shortcut=SHORTCUT%20NAME&code=CODE
And it will redirect to the Shortcut you specified with the code:
shortcuts://run-shortcut?name=SHORTCUT%20NAME&input=text&text=CODEMore detailed information about implementing OAuth 2.0 in your Shortcut