Populating Longitude/Latitude using Avatax?

We want to update the longitude/latitude on most of our customer addresses in Netsuite. I know we can write a script to call something like google. However, we currently have Avatax installed/integrated within Netsuite. There is already a button that was added during that integration that validates address and adds the longitude/latitude by calling a function with Avatax.

Does anyone know of a way this can be used to update a large batch of addresses, as well as automatically update the long/lat when an address is added to Netsuite?