If you’ve been using the AvaTax Developer Guide from the legacy site, this guide is still available on the updated site. In addition, the URLs remain the same, in case you have bookmarked any pages.

To get to the AvaTax Developer Guide, click on Documentation in the upper-left corner, and then select Integration Guides.

This opens a new landing page for the currently available integration guides. Click on the Others card in the main part of the page to open the AvaTax Developer Guide.