You want to know if there is a web address (URL) for either the Sandbox or Production version of Avalara Item Classification.
Avalara Item Classification
There is no web address (URL) for Avalara Item Classification, and there is no user interface for Avalara Item Classification. You interact with Avalara Item Classification via an API or FTP.
If you are using the Item Classification API, the URLs are available in the developer documentation here: https://developer.avalara.com/api-reference/item-classification/v2/.
If you are using the Item Classification FTP, you will be provided a unique URL via email for uploading your classification requests, and a unique URL to retrieve your requests. If you can't locate this email, please contact your Customer Account Manager to receive your information.