Custom URL for Apps

One of our client’s requirements for sharing app URL to external users is that, the app url should of the format .com//authentication_token

I have gone through the out of the box settings, but I am not seeing any settings defined for custom url for apps and also attaching authentication token.

Any guidance would be a great help.

Warm Regards,
Sajal

You can either embed app in another url ( refer embedding section) or use url shortening services. For passing parameters in URL , you can refer how to section for external context